diff --git a/example/openai_server/fastllm_completion.py b/example/openai_server/fastllm_completion.py
index 1922ef01..f5e90052 100644
--- a/example/openai_server/fastllm_completion.py
+++ b/example/openai_server/fastllm_completion.py
@@ -171,6 +171,7 @@ async def chat_completion_full_generator(
       result = ""
       for res in result_generator:
         result += res
+        asyncio.sleep(0)
 
       choice_data = ChatCompletionResponseChoice(
               index=0,