diff --git a/acorn.js b/acorn.js
index 7ed2fc7db6..7ab963e2f0 100644
--- a/acorn.js
+++ b/acorn.js
@@ -1747,10 +1747,6 @@
           }
           break;
 
-        case "ParenthesizedExpression":
-          toAssignable(node.expression, allowSpread, checkType);
-          break;
-
         default:
           if (checkType) unexpected(node.start);
       }
diff --git a/test/tests-harmony.js b/test/tests-harmony.js
index 833d229e46..2302f58f60 100644
--- a/test/tests-harmony.js
+++ b/test/tests-harmony.js
@@ -4448,112 +4448,6 @@ test("var {a:b} = {}", {
   locations: true
 });
 
-
-test("({ x }) = { x: 5 }", {
-  type: "Program",
-  loc: {
-    start: {line: 1, column: 0},
-    end: {line: 1, column: 18}
-  },
-  body: [{
-    type: "ExpressionStatement",
-    loc: {
-      start: {line: 1, column: 0},
-      end: {line: 1, column: 18}
-    },
-    expression: {
-      type: "AssignmentExpression",
-      loc: {
-        start: {line: 1, column: 0},
-        end: {line: 1, column: 18}
-      },
-      operator: "=",
-      left: {
-        type: "ParenthesizedExpression",
-        loc: {
-          start: {line: 1, column: 0},
-          end: {line: 1, column: 7}
-        },
-        expression: {
-          type: "ObjectPattern",
-          loc: {
-            start: {line: 1, column: 1},
-            end: {line: 1, column: 6}
-          },
-          properties: [
-            {
-              type: "Property",
-              loc: {
-                start: {line: 1, column: 3},
-                end: {line: 1, column: 4}
-              },
-              method: false,
-              shorthand: true,
-              computed: false,
-              key: {
-                type: "Identifier",
-                loc: {
-                  start: {line: 1, column: 3},
-                  end: {line: 1, column: 4}
-                },
-                name: "x"
-              },
-              kind: "init",
-              value: {
-                type: "Identifier",
-                loc: {
-                  start: {line: 1, column: 3},
-                  end: {line: 1, column: 4}
-                },
-                name: "x"
-              }
-            }
-          ]
-        }
-      },
-      right: {
-        type: "ObjectExpression",
-        loc: {
-          start: {line: 1, column: 10},
-          end: {line: 1, column: 18}
-        },
-        properties: [{
-          type: "Property",
-          loc: {
-            start: {line: 1, column: 12},
-            end: {line: 1, column: 16}
-          },
-          method: false,
-          shorthand: false,
-          computed: false,
-          key: {
-            type: "Identifier",
-            loc: {
-              start: {line: 1, column: 12},
-              end: {line: 1, column: 13}
-            },
-            name: "x"
-          },
-          value: {
-            type: "Literal",
-            loc: {
-              start: {line: 1, column: 15},
-              end: {line: 1, column: 16}
-            },
-            value: 5,
-            raw: "5"
-          },
-          kind: "init"
-        }]
-      }
-    }
-  }]
-}, {
-  ecmaVersion: 6,
-  locations: true,
-  preserveParens: true
-});
-
 // Harmony: Modules
 
 test("export var document", {