diff --git a/modules/angular2/src/core/reflection/types.dart b/modules/angular2/src/core/reflection/types.dart
index d1bc7fc9a6..2bc51af45c 100644
--- a/modules/angular2/src/core/reflection/types.dart
+++ b/modules/angular2/src/core/reflection/types.dart
@@ -1,5 +1,5 @@
 library reflection.types;
 
-typedef SetterFn(Object obj, value);
-typedef GetterFn(Object obj);
-typedef MethodFn(Object obj, List args);
+typedef SetterFn(obj, value);
+typedef GetterFn(obj);
+typedef MethodFn(obj, List args);