diff --git a/openstackclient/compute/v2/flavor.py b/openstackclient/compute/v2/flavor.py
index eb18a43332..3458cf7969 100644
--- a/openstackclient/compute/v2/flavor.py
+++ b/openstackclient/compute/v2/flavor.py
@@ -295,6 +295,7 @@ class UnsetFlavor(show.ShowOne):
             action='append',
             help='Property to remove from flavor '
                  '(repeat option to unset multiple properties)',
+            required=True,
         )
         parser.add_argument(
             "flavor",