diff --git a/Objects/classobject.c b/Objects/classobject.c
index 4b69842..9d84173 100644
--- a/Objects/classobject.c
+++ b/Objects/classobject.c
@@ -1224,7 +1224,8 @@
 		 * __contains__ attribute, and try iterating instead.
 		 */
 		PyErr_Clear();
-		return _PySequence_IterContains((PyObject *)inst, member);
+		return _PySequence_IterSearch((PyObject *)inst, member,
+					      PY_ITERSEARCH_CONTAINS);
 	}
 	else
 		return -1;