diff --git a/tests/test_clients.py b/tests/test_clients.py
index 495109e7..de402ebe 100644
--- a/tests/test_clients.py
+++ b/tests/test_clients.py
@@ -595,7 +595,9 @@ async def test_crossref_retraction_status(stub_data_dir: Path) -> None:
             title="The Dilemma and Countermeasures of Music Education under the Background of Big Data",
             fields=["title", "doi", "authors", "journal"],
         )
-
-        assert "**RETRACTED ARTICLE** Citation: Jiaye Han." in crossref_details.formatted_citation  # type: ignore[union-attr]
-
-        assert crossref_details.is_retracted is True, "Should be retracted"  # type: ignore[union-attr]
+        assert crossref_details
+        assert (
+            "**RETRACTED ARTICLE** Citation: Jiaye Han."
+            in crossref_details.formatted_citation
+        )
+        assert crossref_details.is_retracted is True, "Should be retracted"