diff --git a/tests/test_webservice.py b/tests/test_webservice.py
index b302d466f1d52992eb6d85dd31f8ceeb29935b9b..a61c7e12be7ac6515b7105fc1ee9699449f39afd 100644
--- a/tests/test_webservice.py
+++ b/tests/test_webservice.py
@@ -230,7 +230,7 @@ async def test_run_action(mode, cmd, retcode, expected, monkeypatch):
     job_db = mock.Mock()
 
     async def mock_run_proc_async(*args):
-        return retcode, b'Submitted job: 42'
+        return retcode, b'Submitted job: 42', b''
 
     monkeypatch.setattr(
         webservice.webservice, 'run_proc_async', mock_run_proc_async