diff --git a/tests/test_views_multipart.py b/tests/test_views_multipart.py
index 3b4774e..0b57ca6 100644
--- a/tests/test_views_multipart.py
+++ b/tests/test_views_multipart.py
@@ -484,7 +484,7 @@ def _mock_celery_result():
         if res.status_code == 200:
             data = get_json(res)
             assert data["completed"] is True
-            assert task.called_with(str(multipart.upload_id))
+            assert task.delay.call_args.args == (str(multipart.upload_id),)
             # Two whitespaces expected to have been sent to client before
             # JSON was sent.
             assert res.data.startswith(b"  {")