diff --git a/tests/conftest.py b/tests/conftest.py
index b028a7f4140..2f083d703a2 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -365,6 +365,7 @@ def clear_exception_traceback(request: pytest.FixtureRequest) -> Generator[None]
             "error_type",
             "exc",
             "exception",
+            "expand_side_effect",
             "expectation",
             "raise_error",
             "expected_result",