diff --git a/src/lib/es2015.generator.d.ts b/src/lib/es2015.generator.d.ts
index 2f522ad877..d7a3ff1606 100644
--- a/src/lib/es2015.generator.d.ts
+++ b/src/lib/es2015.generator.d.ts
@@ -1,4 +1,13 @@
-interface GeneratorFunction extends Function { }
+interface Generator extends Iterator<any> { }
+
+interface GeneratorFunction {
+    /**
+     * Creates a new Generator object.
+     * @param args A list of arguments the function accepts.
+     */
+    new (...args: any[]): Generator;
+    (...args: any[]): Generator;
+}
 
 interface GeneratorFunctionConstructor {
     /**
diff --git a/src/lib/es2015.symbol.wellknown.d.ts b/src/lib/es2015.symbol.wellknown.d.ts
index 71e4cb7c89..5334dae9e0 100644
--- a/src/lib/es2015.symbol.wellknown.d.ts
+++ b/src/lib/es2015.symbol.wellknown.d.ts
@@ -137,7 +137,7 @@ interface Function {
     [Symbol.hasInstance](value: any): boolean;
 }
 
-interface GeneratorFunction extends Function {
+interface GeneratorFunction {
     readonly [Symbol.toStringTag]: "GeneratorFunction";
 }