diff --git a/pkg/async_helper/lib/async_helper.dart b/pkg/async_helper/lib/async_helper.dart
index 72a391f03a0..84df557a811 100644
--- a/pkg/async_helper/lib/async_helper.dart
+++ b/pkg/async_helper/lib/async_helper.dart
@@ -62,7 +62,7 @@ void asyncEnd() {
   }
 }
 
-void asyncTest(Future f()) {
+void asyncTest(f()) {
   asyncStart();
   f().whenComplete(() => asyncEnd());
 }
\ No newline at end of file