diff --git a/src/lib/es2015.generator.d.ts b/src/lib/es2015.generator.d.ts
index 8ea4f2f9630..92bb8dca868 100644
--- a/src/lib/es2015.generator.d.ts
+++ b/src/lib/es2015.generator.d.ts
@@ -49,4 +49,3 @@ interface GeneratorFunctionConstructor {
      */
     readonly prototype: GeneratorFunction;
 }
-declare var GeneratorFunction: GeneratorFunctionConstructor;