diff --git a/packages/babylon/src/parser/statement.js b/packages/babylon/src/parser/statement.js
index 8d802f5c93..82bd72dcd4 100644
--- a/packages/babylon/src/parser/statement.js
+++ b/packages/babylon/src/parser/statement.js
@@ -225,6 +225,10 @@ export default class StatementParser extends ExpressionParser {
     }
   }
 
+  canHaveLeadingDecorator(): boolean {
+    return this.match(tt._class);
+  }
+
   parseDecorators(allowExport?: boolean): void {
     if (this.hasPlugin("decorators2")) {
       allowExport = false;
@@ -250,7 +254,7 @@ export default class StatementParser extends ExpressionParser {
       }
     }
 
-    if (!this.match(tt._class)) {
+    if (!this.canHaveLeadingDecorator()) {
       this.raise(
         this.state.start,
         "Leading decorators must be attached to a class declaration",
diff --git a/packages/babylon/src/plugins/typescript.js b/packages/babylon/src/plugins/typescript.js
index c623dbb554..f1473c5d72 100644
--- a/packages/babylon/src/plugins/typescript.js
+++ b/packages/babylon/src/plugins/typescript.js
@@ -1489,11 +1489,14 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       }
     }
 
+    isAbstractClass(): boolean {
+      return (
+        this.isContextual("abstract") && this.lookahead().type === tt._class
+      );
+    }
+
     parseExportDefaultExpression(): N.Expression | N.Declaration {
-      if (
-        this.isContextual("abstract") &&
-        this.lookahead().type === tt._class
-      ) {
+      if (this.isAbstractClass()) {
         const cls = this.startNode();
         this.next(); // Skip "abstract"
         this.parseClass(cls, true, true);
@@ -2084,4 +2087,9 @@ export default (superClass: Class<Parser>): Class<Parser> =>
     shouldParseAsyncArrow(): boolean {
       return this.match(tt.colon) || super.shouldParseAsyncArrow();
     }
+
+    canHaveLeadingDecorator() {
+      // Avoid unnecessary lookahead in checking for abstract class unless needed!
+      return super.canHaveLeadingDecorator() || this.isAbstractClass();
+    }
   };
diff --git a/packages/babylon/test/fixtures/typescript/decorators/abstract-class/input.js b/packages/babylon/test/fixtures/typescript/decorators/abstract-class/input.js
new file mode 100644
index 0000000000..ef03c08991
--- /dev/null
+++ b/packages/babylon/test/fixtures/typescript/decorators/abstract-class/input.js
@@ -0,0 +1,6 @@
+@decorate()
+abstract class Test extends Object {
+  constructor() {
+    super();
+  }
+}
diff --git a/packages/babylon/test/fixtures/typescript/decorators/abstract-class/options.json b/packages/babylon/test/fixtures/typescript/decorators/abstract-class/options.json
new file mode 100644
index 0000000000..f6d2d63c2d
--- /dev/null
+++ b/packages/babylon/test/fixtures/typescript/decorators/abstract-class/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["decorators", "typescript"]
+}
diff --git a/packages/babylon/test/fixtures/typescript/decorators/abstract-class/output.json b/packages/babylon/test/fixtures/typescript/decorators/abstract-class/output.json
new file mode 100644
index 0000000000..f0c716d0db
--- /dev/null
+++ b/packages/babylon/test/fixtures/typescript/decorators/abstract-class/output.json
@@ -0,0 +1,254 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 85,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 6,
+      "column": 1
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 85,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 6,
+        "column": 1
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "ClassDeclaration",
+        "start": 0,
+        "end": 85,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 6,
+            "column": 1
+          }
+        },
+        "abstract": true,
+        "decorators": [
+          {
+            "type": "Decorator",
+            "start": 0,
+            "end": 11,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 0
+              },
+              "end": {
+                "line": 1,
+                "column": 11
+              }
+            },
+            "callee": {
+              "type": "CallExpression",
+              "start": 1,
+              "end": 11,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 1
+                },
+                "end": {
+                  "line": 1,
+                  "column": 11
+                }
+              },
+              "callee": {
+                "type": "Identifier",
+                "start": 1,
+                "end": 9,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 1
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 9
+                  },
+                  "identifierName": "decorate"
+                },
+                "name": "decorate"
+              },
+              "arguments": []
+            }
+          }
+        ],
+        "id": {
+          "type": "Identifier",
+          "start": 27,
+          "end": 31,
+          "loc": {
+            "start": {
+              "line": 2,
+              "column": 15
+            },
+            "end": {
+              "line": 2,
+              "column": 19
+            },
+            "identifierName": "Test"
+          },
+          "name": "Test"
+        },
+        "superClass": {
+          "type": "Identifier",
+          "start": 40,
+          "end": 46,
+          "loc": {
+            "start": {
+              "line": 2,
+              "column": 28
+            },
+            "end": {
+              "line": 2,
+              "column": 34
+            },
+            "identifierName": "Object"
+          },
+          "name": "Object"
+        },
+        "body": {
+          "type": "ClassBody",
+          "start": 47,
+          "end": 85,
+          "loc": {
+            "start": {
+              "line": 2,
+              "column": 35
+            },
+            "end": {
+              "line": 6,
+              "column": 1
+            }
+          },
+          "body": [
+            {
+              "type": "ClassMethod",
+              "start": 51,
+              "end": 83,
+              "loc": {
+                "start": {
+                  "line": 3,
+                  "column": 2
+                },
+                "end": {
+                  "line": 5,
+                  "column": 3
+                }
+              },
+              "static": false,
+              "key": {
+                "type": "Identifier",
+                "start": 51,
+                "end": 62,
+                "loc": {
+                  "start": {
+                    "line": 3,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 3,
+                    "column": 13
+                  },
+                  "identifierName": "constructor"
+                },
+                "name": "constructor"
+              },
+              "computed": false,
+              "kind": "constructor",
+              "id": null,
+              "generator": false,
+              "async": false,
+              "params": [],
+              "body": {
+                "type": "BlockStatement",
+                "start": 65,
+                "end": 83,
+                "loc": {
+                  "start": {
+                    "line": 3,
+                    "column": 16
+                  },
+                  "end": {
+                    "line": 5,
+                    "column": 3
+                  }
+                },
+                "body": [
+                  {
+                    "type": "ExpressionStatement",
+                    "start": 71,
+                    "end": 79,
+                    "loc": {
+                      "start": {
+                        "line": 4,
+                        "column": 4
+                      },
+                      "end": {
+                        "line": 4,
+                        "column": 12
+                      }
+                    },
+                    "expression": {
+                      "type": "CallExpression",
+                      "start": 71,
+                      "end": 78,
+                      "loc": {
+                        "start": {
+                          "line": 4,
+                          "column": 4
+                        },
+                        "end": {
+                          "line": 4,
+                          "column": 11
+                        }
+                      },
+                      "callee": {
+                        "type": "Super",
+                        "start": 71,
+                        "end": 76,
+                        "loc": {
+                          "start": {
+                            "line": 4,
+                            "column": 4
+                          },
+                          "end": {
+                            "line": 4,
+                            "column": 9
+                          }
+                        }
+                      },
+                      "arguments": []
+                    }
+                  }
+                ],
+                "directives": []
+              }
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file