diff --git a/litellm/utils.py b/litellm/utils.py
index 0ce46bce7c9..a80c79c61f6 100644
--- a/litellm/utils.py
+++ b/litellm/utils.py
@@ -8448,7 +8448,9 @@ def validate_and_fix_openai_messages(
             ),
         )
         cleaned_message = cleanup_none_field_in_message(message=convert_msg_to_dict)
-        new_messages.append(cast(AllMessageValues, cleaned_message))  # cast-ok: cleanup_none_field_in_message return satisfies AllMessageValues
+        new_messages.append(
+            cast(AllMessageValues, cleaned_message)
+        )  # cast-ok: cleanup_none_field_in_message return satisfies AllMessageValues
     return validate_chat_completion_user_messages(messages=new_messages)