diff --git a/vertexai/preview/reasoning_engines/templates/adk.py b/vertexai/preview/reasoning_engines/templates/adk.py
index 9ba7a276d2..38065d1cbc 100644
--- a/vertexai/preview/reasoning_engines/templates/adk.py
+++ b/vertexai/preview/reasoning_engines/templates/adk.py
@@ -1012,7 +1012,7 @@ async def _invoke_agent_async():
             # Run the agent.
             message_for_agent = types.Content(**request.message)
             try:
-                for event in runner.run_async(
+                for event in runner.run(
                     user_id=request.user_id,
                     session_id=session.id,
                     new_message=message_for_agent,