diff --git a/tests/util/TestUtil.h b/tests/util/TestUtil.h
index 4326c3bd73..b28797991d 100644
--- a/tests/util/TestUtil.h
+++ b/tests/util/TestUtil.h
@@ -21,7 +21,7 @@ struct TestUtil {
 };
 
 struct ScopedEventSubscription {
-  explicit ScopedEventSubscription(std::function<Event::Subscriber>&&);
+  explicit ScopedEventSubscription(std::function<Event::Subscriber>&& s);
   ~ScopedEventSubscription();
 };