diff --git a/tests/test_logging.py b/tests/test_logging.py
index 4580d6b6..e95b7ce5 100644
--- a/tests/test_logging.py
+++ b/tests/test_logging.py
@@ -104,4 +104,4 @@ def test_log_connection_lost(debug, monkeypatch):
         assert log.startswith(
             'Connection lost before response written @')
     else:
-        'Connection lost before response written @' not in log
+        assert 'Connection lost before response written @' not in log