diff --git a/python/sglang/bench_serving.py b/python/sglang/bench_serving.py
index 574b81f47..793a1ab2f 100644
--- a/python/sglang/bench_serving.py
+++ b/python/sglang/bench_serving.py
@@ -401,6 +401,7 @@ async def async_request_openai_chat_completions(
 
                                     # Decoding phase
                                     else:
+                                        output.text_chunks.append(content)
                                         output.itl.append(
                                             timestamp - most_recent_timestamp
                                         )