diff --git a/aodh/cmd/alarm_conversion.py b/aodh/cmd/alarm_conversion.py
index 721dc7faa..b70aaaa52 100644
--- a/aodh/cmd/alarm_conversion.py
+++ b/aodh/cmd/alarm_conversion.py
@@ -80,7 +80,6 @@ def get_parser():
     )
     parser.add_argument(
         '--alarm-id',
-        default=None,
         type=str,
         help='Only convert the alarm specified by this option.',
     )