diff --git a/src/plugins/flow.js b/src/plugins/flow.js
index 007a403e28..23aa49e175 100644
--- a/src/plugins/flow.js
+++ b/src/plugins/flow.js
@@ -559,6 +559,18 @@ pp.flowParsePrimaryType = function () {
       this.next();
       return this.finishNode(node, "BooleanLiteralTypeAnnotation");
 
+    case tt.plusMin:
+      if (this.state.value === "-") {
+        this.next();
+        if (!this.match(tt.num)) this.unexpected();
+
+        node.value = -this.state.value;
+        this.addExtra(node, "rawValue", node.value);
+        this.addExtra(node, "raw", this.input.slice(this.state.start, this.state.end));
+        this.next();
+        return this.finishNode(node, "NumericLiteralTypeAnnotation");
+      }
+
     case tt.num:
       node.value = this.state.value;
       this.addExtra(node, "rawValue", node.value);
diff --git a/test/fixtures/flow/literal-types/number-negative-binary/actual.js b/test/fixtures/flow/literal-types/number-negative-binary/actual.js
new file mode 100644
index 0000000000..665417b13a
--- /dev/null
+++ b/test/fixtures/flow/literal-types/number-negative-binary/actual.js
@@ -0,0 +1 @@
+var a: 0b1111011
diff --git a/test/fixtures/flow/literal-types/number-negative-binary/expected.json b/test/fixtures/flow/literal-types/number-negative-binary/expected.json
new file mode 100644
index 0000000000..44d455a56d
--- /dev/null
+++ b/test/fixtures/flow/literal-types/number-negative-binary/expected.json
@@ -0,0 +1,119 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 16,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 16
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 16,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 16
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 16,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 16
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 16,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 16
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 16,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 16
+                }
+              },
+              "name": "a",
+              "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "start": 5,
+                "end": 16,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 16
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "NumericLiteralTypeAnnotation",
+                  "start": 7,
+                  "end": 16,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 7
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 16
+                    }
+                  },
+                  "value": 123,
+                  "extra": {
+                    "rawValue": 123,
+                    "raw": "0b1111011"
+                  }
+                }
+              }
+            },
+            "init": null
+          }
+        ],
+        "kind": "var"
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/test/fixtures/flow/literal-types/number-negative-float/actual.js b/test/fixtures/flow/literal-types/number-negative-float/actual.js
new file mode 100644
index 0000000000..a1a32f959f
--- /dev/null
+++ b/test/fixtures/flow/literal-types/number-negative-float/actual.js
@@ -0,0 +1 @@
+var a: -123.0
diff --git a/test/fixtures/flow/literal-types/number-negative-float/expected.json b/test/fixtures/flow/literal-types/number-negative-float/expected.json
new file mode 100644
index 0000000000..735c2e093f
--- /dev/null
+++ b/test/fixtures/flow/literal-types/number-negative-float/expected.json
@@ -0,0 +1,119 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 13,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 13
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 13,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 13
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 13,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 13
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 13,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 13
+                }
+              },
+              "name": "a",
+              "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "start": 5,
+                "end": 13,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 13
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "NumericLiteralTypeAnnotation",
+                  "start": 7,
+                  "end": 13,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 7
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 13
+                    }
+                  },
+                  "value": -123,
+                  "extra": {
+                    "rawValue": -123,
+                    "raw": "123.0"
+                  }
+                }
+              }
+            },
+            "init": null
+          }
+        ],
+        "kind": "var"
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/test/fixtures/flow/literal-types/number-negative-octal-2/actual.js b/test/fixtures/flow/literal-types/number-negative-octal-2/actual.js
new file mode 100644
index 0000000000..e9eb626734
--- /dev/null
+++ b/test/fixtures/flow/literal-types/number-negative-octal-2/actual.js
@@ -0,0 +1 @@
+var a: -0o173
diff --git a/test/fixtures/flow/literal-types/number-negative-octal-2/expected.json b/test/fixtures/flow/literal-types/number-negative-octal-2/expected.json
new file mode 100644
index 0000000000..489e2faac9
--- /dev/null
+++ b/test/fixtures/flow/literal-types/number-negative-octal-2/expected.json
@@ -0,0 +1,119 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 13,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 13
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 13,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 13
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 13,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 13
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 13,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 13
+                }
+              },
+              "name": "a",
+              "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "start": 5,
+                "end": 13,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 13
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "NumericLiteralTypeAnnotation",
+                  "start": 7,
+                  "end": 13,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 7
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 13
+                    }
+                  },
+                  "value": -123,
+                  "extra": {
+                    "rawValue": -123,
+                    "raw": "0o173"
+                  }
+                }
+              }
+            },
+            "init": null
+          }
+        ],
+        "kind": "var"
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/test/fixtures/flow/literal-types/number-negative-octal/actual.js b/test/fixtures/flow/literal-types/number-negative-octal/actual.js
new file mode 100644
index 0000000000..f808ab87df
--- /dev/null
+++ b/test/fixtures/flow/literal-types/number-negative-octal/actual.js
@@ -0,0 +1 @@
+var a: -0x7B
diff --git a/test/fixtures/flow/literal-types/number-negative-octal/expected.json b/test/fixtures/flow/literal-types/number-negative-octal/expected.json
new file mode 100644
index 0000000000..2ac2c96235
--- /dev/null
+++ b/test/fixtures/flow/literal-types/number-negative-octal/expected.json
@@ -0,0 +1,119 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 12,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 12
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 12,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 12
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 12,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 12
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 12,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 12
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 12,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 12
+                }
+              },
+              "name": "a",
+              "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "start": 5,
+                "end": 12,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 12
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "NumericLiteralTypeAnnotation",
+                  "start": 7,
+                  "end": 12,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 7
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 12
+                    }
+                  },
+                  "value": -123,
+                  "extra": {
+                    "rawValue": -123,
+                    "raw": "0x7B"
+                  }
+                }
+              }
+            },
+            "init": null
+          }
+        ],
+        "kind": "var"
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/test/fixtures/flow/type-annotations/negative-number-literal/actual.js b/test/fixtures/flow/type-annotations/negative-number-literal/actual.js
new file mode 100644
index 0000000000..fd282fd7b1
--- /dev/null
+++ b/test/fixtures/flow/type-annotations/negative-number-literal/actual.js
@@ -0,0 +1,12 @@
+/**
+ * @flow
+ */
+
+type DirectionVector =
+  | -1
+  | 0
+  | 1;
+
+
+var x:DirectionVector = -1;
+console.log('foo');
diff --git a/test/fixtures/flow/type-annotations/negative-number-literal/expected.json b/test/fixtures/flow/type-annotations/negative-number-literal/expected.json
new file mode 100644
index 0000000000..52ca7d33a2
--- /dev/null
+++ b/test/fixtures/flow/type-annotations/negative-number-literal/expected.json
@@ -0,0 +1,415 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 110,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 12,
+      "column": 19
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 110,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 12,
+        "column": 19
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "TypeAlias",
+        "start": 18,
+        "end": 60,
+        "loc": {
+          "start": {
+            "line": 5,
+            "column": 0
+          },
+          "end": {
+            "line": 8,
+            "column": 6
+          }
+        },
+        "id": {
+          "type": "Identifier",
+          "start": 23,
+          "end": 38,
+          "loc": {
+            "start": {
+              "line": 5,
+              "column": 5
+            },
+            "end": {
+              "line": 5,
+              "column": 20
+            }
+          },
+          "name": "DirectionVector"
+        },
+        "typeParameters": null,
+        "right": {
+          "type": "UnionTypeAnnotation",
+          "start": 45,
+          "end": 59,
+          "loc": {
+            "start": {
+              "line": 6,
+              "column": 4
+            },
+            "end": {
+              "line": 8,
+              "column": 5
+            }
+          },
+          "types": [
+            {
+              "type": "NumericLiteralTypeAnnotation",
+              "start": 45,
+              "end": 47,
+              "loc": {
+                "start": {
+                  "line": 6,
+                  "column": 4
+                },
+                "end": {
+                  "line": 6,
+                  "column": 6
+                }
+              },
+              "value": -1,
+              "extra": {
+                "rawValue": -1,
+                "raw": "1"
+              }
+            },
+            {
+              "type": "NumericLiteralTypeAnnotation",
+              "start": 52,
+              "end": 53,
+              "loc": {
+                "start": {
+                  "line": 7,
+                  "column": 4
+                },
+                "end": {
+                  "line": 7,
+                  "column": 5
+                }
+              },
+              "value": 0,
+              "extra": {
+                "rawValue": 0,
+                "raw": "0"
+              }
+            },
+            {
+              "type": "NumericLiteralTypeAnnotation",
+              "start": 58,
+              "end": 59,
+              "loc": {
+                "start": {
+                  "line": 8,
+                  "column": 4
+                },
+                "end": {
+                  "line": 8,
+                  "column": 5
+                }
+              },
+              "value": 1,
+              "extra": {
+                "rawValue": 1,
+                "raw": "1"
+              }
+            }
+          ]
+        },
+        "leadingComments": [
+          {
+            "type": "CommentBlock",
+            "value": "*\n * @flow\n ",
+            "start": 0,
+            "end": 16,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 3,
+                "column": 3
+              }
+            }
+          }
+        ]
+      },
+      {
+        "type": "VariableDeclaration",
+        "start": 63,
+        "end": 90,
+        "loc": {
+          "start": {
+            "line": 11,
+            "column": 0
+          },
+          "end": {
+            "line": 11,
+            "column": 27
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 67,
+            "end": 89,
+            "loc": {
+              "start": {
+                "line": 11,
+                "column": 4
+              },
+              "end": {
+                "line": 11,
+                "column": 26
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 67,
+              "end": 84,
+              "loc": {
+                "start": {
+                  "line": 11,
+                  "column": 4
+                },
+                "end": {
+                  "line": 11,
+                  "column": 21
+                }
+              },
+              "name": "x",
+              "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "start": 68,
+                "end": 84,
+                "loc": {
+                  "start": {
+                    "line": 11,
+                    "column": 5
+                  },
+                  "end": {
+                    "line": 11,
+                    "column": 21
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "GenericTypeAnnotation",
+                  "start": 69,
+                  "end": 84,
+                  "loc": {
+                    "start": {
+                      "line": 11,
+                      "column": 6
+                    },
+                    "end": {
+                      "line": 11,
+                      "column": 21
+                    }
+                  },
+                  "typeParameters": null,
+                  "id": {
+                    "type": "Identifier",
+                    "start": 69,
+                    "end": 84,
+                    "loc": {
+                      "start": {
+                        "line": 11,
+                        "column": 6
+                      },
+                      "end": {
+                        "line": 11,
+                        "column": 21
+                      }
+                    },
+                    "name": "DirectionVector"
+                  }
+                }
+              }
+            },
+            "init": {
+              "type": "UnaryExpression",
+              "start": 87,
+              "end": 89,
+              "loc": {
+                "start": {
+                  "line": 11,
+                  "column": 24
+                },
+                "end": {
+                  "line": 11,
+                  "column": 26
+                }
+              },
+              "operator": "-",
+              "prefix": true,
+              "extra": {
+                "parenthesizedArgument": false
+              },
+              "argument": {
+                "type": "NumericLiteral",
+                "start": 88,
+                "end": 89,
+                "loc": {
+                  "start": {
+                    "line": 11,
+                    "column": 25
+                  },
+                  "end": {
+                    "line": 11,
+                    "column": 26
+                  }
+                },
+                "extra": {
+                  "rawValue": 1,
+                  "raw": "1"
+                },
+                "value": 1
+              }
+            }
+          }
+        ],
+        "kind": "var"
+      },
+      {
+        "type": "ExpressionStatement",
+        "start": 91,
+        "end": 110,
+        "loc": {
+          "start": {
+            "line": 12,
+            "column": 0
+          },
+          "end": {
+            "line": 12,
+            "column": 19
+          }
+        },
+        "expression": {
+          "type": "CallExpression",
+          "start": 91,
+          "end": 109,
+          "loc": {
+            "start": {
+              "line": 12,
+              "column": 0
+            },
+            "end": {
+              "line": 12,
+              "column": 18
+            }
+          },
+          "callee": {
+            "type": "MemberExpression",
+            "start": 91,
+            "end": 102,
+            "loc": {
+              "start": {
+                "line": 12,
+                "column": 0
+              },
+              "end": {
+                "line": 12,
+                "column": 11
+              }
+            },
+            "object": {
+              "type": "Identifier",
+              "start": 91,
+              "end": 98,
+              "loc": {
+                "start": {
+                  "line": 12,
+                  "column": 0
+                },
+                "end": {
+                  "line": 12,
+                  "column": 7
+                }
+              },
+              "name": "console"
+            },
+            "property": {
+              "type": "Identifier",
+              "start": 99,
+              "end": 102,
+              "loc": {
+                "start": {
+                  "line": 12,
+                  "column": 8
+                },
+                "end": {
+                  "line": 12,
+                  "column": 11
+                }
+              },
+              "name": "log"
+            },
+            "computed": false
+          },
+          "arguments": [
+            {
+              "type": "StringLiteral",
+              "start": 103,
+              "end": 108,
+              "loc": {
+                "start": {
+                  "line": 12,
+                  "column": 12
+                },
+                "end": {
+                  "line": 12,
+                  "column": 17
+                }
+              },
+              "extra": {
+                "rawValue": "foo",
+                "raw": "'foo'"
+              },
+              "value": "foo"
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  },
+  "comments": [
+    {
+      "type": "CommentBlock",
+      "value": "*\n * @flow\n ",
+      "start": 0,
+      "end": 16,
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0
+        },
+        "end": {
+          "line": 3,
+          "column": 3
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file