diff --git a/actions/service b/actions/service
index 2e2c956f8..6decc050d 100755
--- a/actions/service
+++ b/actions/service
@@ -51,6 +51,7 @@ def parse_arguments():
 
     subparsers.add_parser('list', help='List of running system services')
 
+    subparsers.required = True
     return parser.parse_args()