diff --git a/swh/lister/launchpad/tasks.py b/swh/lister/launchpad/tasks.py
index a67d365..671e962 100644
--- a/swh/lister/launchpad/tasks.py
+++ b/swh/lister/launchpad/tasks.py
@@ -1,27 +1,27 @@
 # Copyright (C) 2020-2021  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from celery import shared_task
 
 from .lister import LaunchpadLister
 
 
 @shared_task(name=__name__ + ".ping")
-def ping():
+def _ping():
     return "OK"
 
 
 @shared_task(name=__name__ + ".FullLaunchpadLister")
 def list_launchpad_full(**lister_args):
     """Full listing of git repositories hosted on Launchpad"""
     lister = LaunchpadLister.from_configfile(**lister_args)
     return lister.run().dict()
 
 
 @shared_task(name=__name__ + ".IncrementalLaunchpadLister")
 def list_launchpad_incremental(**lister_args):
     """Incremental listing of git repositories hosted on Launchpad"""
     lister = LaunchpadLister.from_configfile(**lister_args, incremental=True)
     return lister.run().dict()