diff --git a/tests/llm_responses_api_testing/test_anthropic_responses_api.py b/tests/llm_responses_api_testing/test_anthropic_responses_api.py
index 51c23b3664..3eabc0c15b 100644
--- a/tests/llm_responses_api_testing/test_anthropic_responses_api.py
+++ b/tests/llm_responses_api_testing/test_anthropic_responses_api.py
@@ -36,7 +36,7 @@ class TestAnthropicResponsesAPITest(BaseResponsesAPITest):
     async def test_basic_openai_responses_streaming_delete_endpoint(self, sync_mode=False):
         pass
 
-    async def test_basic_openai_responses_get_endpoint(self, sync_mode):
+    async def test_basic_openai_responses_get_endpoint(self, sync_mode=False):
         pass