diff --git a/tests/unit/config/test_configinit.py b/tests/unit/config/test_configinit.py
index 767ffd6ca..fef352584 100644
--- a/tests/unit/config/test_configinit.py
+++ b/tests/unit/config/test_configinit.py
@@ -151,7 +151,7 @@ def test_late_init(init_patch, monkeypatch, fake_save_manager, fake_args,
         assert text.startswith('Errors occurred while reading config.py:')
         assert '<b>Error text</b>: Exception' in text
     else:
-        msgbox_mock.assert_not_called()
+        assert not msgbox_mock.called
 
 
 class TestQtArgs: