diff --git a/swh/lister/launchpad/tasks.py b/swh/lister/launchpad/tasks.py
--- a/swh/lister/launchpad/tasks.py
+++ b/swh/lister/launchpad/tasks.py
@@ -9,7 +9,7 @@
 
 
 @shared_task(name=__name__ + ".ping")
-def ping():
+def _ping():
     return "OK"