diff --git a/swh/deposit/tests/loader/test_tasks.py b/swh/deposit/tests/loader/test_tasks.py
index ea69b7fc..e4453d61 100644
--- a/swh/deposit/tests/loader/test_tasks.py
+++ b/swh/deposit/tests/loader/test_tasks.py
@@ -1,24 +1,24 @@
 # Copyright (C) 2018-2020  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import pytest
 
 from unittest.mock import patch
 
 
 @pytest.mark.db
-@patch("swh.deposit.loader.checker.DepositChecker.check")
-def test_deposit_check(checker, swh_config, swh_app, celery_session_worker):
+def test_deposit_check(mocker, swh_config, swh_app, celery_session_worker):
+    checker = mocker.patch("swh.deposit.loader.checker.DepositChecker.check")
     checker.return_value = {"status": "uneventful"}
 
     res = swh_app.send_task(
         "swh.deposit.loader.tasks.ChecksDepositTsk", args=["collection", 42]
     )
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {"status": "uneventful"}
     checker.assert_called_once_with("collection", 42)