diff --git a/swh/scheduler/celery_backend/listener.py b/swh/scheduler/celery_backend/listener.py
--- a/swh/scheduler/celery_backend/listener.py
+++ b/swh/scheduler/celery_backend/listener.py
@@ -172,6 +172,7 @@
 
     recv.capture(limit=None, timeout=None, wakeup=True)
 
+
 if __name__ == '__main__':
     main_backend = SchedulerBackend()
     event_monitor(main_app, main_backend)
diff --git a/swh/scheduler/celery_backend/runner.py b/swh/scheduler/celery_backend/runner.py
--- a/swh/scheduler/celery_backend/runner.py
+++ b/swh/scheduler/celery_backend/runner.py
@@ -49,6 +49,7 @@
 
         backend.commit()
 
+
 if __name__ == '__main__':
     for module in main_app.conf.CELERY_IMPORTS:
         __import__(module)