diff --git a/patroni/ctl.py b/patroni/ctl.py
index a58da39d..f8b4b524 100644
--- a/patroni/ctl.py
+++ b/patroni/ctl.py
@@ -1101,7 +1101,7 @@ def edit_config(obj, cluster_name, force, quiet, kvpairs, pgkvpairs, apply_filen
 
 
 @ctl.command('show-config', help="Show cluster configuration")
-@click.argument('cluster_name')
+@arg_cluster_name
 @click.pass_obj
 def show_config(obj, cluster_name):
     cluster = get_dcs(obj, cluster_name).get_cluster()