diff --git a/tests/mock/mock_llm.py b/tests/mock/mock_llm.py
index 45b28c63b..a52aeed09 100644
--- a/tests/mock/mock_llm.py
+++ b/tests/mock/mock_llm.py
@@ -69,7 +69,6 @@ class MockLLM(OriginalLLM):
         A copy of metagpt.provider.openai_api.OpenAILLM.aask_code, we can't use super().aask because it will be mocked.
         Since openai_api.OpenAILLM.aask_code is different from base_llm.BaseLLM.aask_code, we use the former.
         """
-        messages = self._process_message(messages)
         rsp = await self._achat_completion_function(messages, **kwargs)
         return self.get_choice_function_arguments(rsp)