diff --git a/python_modules/libraries/dagster-openai/dagster_openai_tests/test_resources.py b/python_modules/libraries/dagster-openai/dagster_openai_tests/test_resources.py
index bd2ffa1e1e3d0..1d7ffcb5e3968 100644
--- a/python_modules/libraries/dagster-openai/dagster_openai_tests/test_resources.py
+++ b/python_modules/libraries/dagster-openai/dagster_openai_tests/test_resources.py
@@ -71,7 +71,7 @@ def openai_op(openai_resource: OpenAIResource):
             )
 
         assert mock_client.called
-        assert mock_wrapper.not_called
+        assert not mock_wrapper.called
 
     result = wrap_op_in_graph_and_execute(
         openai_op,