diff --git a/app/src/include/firebase/internal/future_impl.h b/app/src/include/firebase/internal/future_impl.h
index a16039d862..7783d7cc60 100644
--- a/app/src/include/firebase/internal/future_impl.h
+++ b/app/src/include/firebase/internal/future_impl.h
@@ -171,9 +171,8 @@ Future<T>::OnCompletion(
       reinterpret_cast<CompletionCallback>(callback), user_data);
 }
 #else
-void
 template <class T>
-Future<T>::OnCompletion(
+void Future<T>::OnCompletion(
     TypedCompletionCallback callback, void* user_data) const {
   FutureBase::OnCompletion(
       reinterpret_cast<CompletionCallback>(callback), user_data);