diff --git a/swh/storage/cli.py b/swh/storage/cli.py
--- a/swh/storage/cli.py
+++ b/swh/storage/cli.py
@@ -19,7 +19,7 @@
 
 
 @storage.command(name='rpc-serve')
-@click.argument('config-path', required=1)
+@click.argument('config-path', required=True)
 @click.option('--host', default='0.0.0.0',
               metavar='IP', show_default=True,
               help="Host ip address to bind the server on")