diff --git a/python/sglang/srt/entrypoints/openai/serving_chat.py b/python/sglang/srt/entrypoints/openai/serving_chat.py
index 21b21bb1b..9914a4c2e 100644
--- a/python/sglang/srt/entrypoints/openai/serving_chat.py
+++ b/python/sglang/srt/entrypoints/openai/serving_chat.py
@@ -213,7 +213,6 @@ class OpenAIServingChat(OpenAIServingBase):
                 add_generation_prompt=True,
                 tools=tools,
                 reasoning_effort=request.reasoning_effort,
-                builtin_tools=[],
                 **(
                     request.chat_template_kwargs if request.chat_template_kwargs else {}
                 ),
@@ -233,7 +232,6 @@ class OpenAIServingChat(OpenAIServingBase):
                 add_generation_prompt=True,
                 tools=tools,
                 reasoning_effort=request.reasoning_effort,
-                builtin_tools=[],
                 **(
                     request.chat_template_kwargs if request.chat_template_kwargs else {}
                 ),