diff --git a/runtime/runtime_controller.cc b/runtime/runtime_controller.cc
index c0874db466c..a2ea4a00d24 100644
--- a/runtime/runtime_controller.cc
+++ b/runtime/runtime_controller.cc
@@ -397,6 +397,9 @@ bool RuntimeController::LaunchRootIsolate(
   }
 
   FML_DCHECK(Dart_CurrentIsolate() == nullptr);
+
+  client_.OnRootIsolateCreated();
+
   return true;
 }