diff --git a/tests/api/test_p2p.py b/tests/api/test_p2p.py
index ee352319d..5016162e5 100644
--- a/tests/api/test_p2p.py
+++ b/tests/api/test_p2p.py
@@ -97,4 +97,4 @@ async def test_post_message_sync(ccn_api_client, mocker):
     assert pub_status["failed"] == []
 
     # Check that we cleaned up the queue
-    assert mocked_queue.delete.called_once
+    assert mocked_queue.delete.assert_called_once()