diff --git a/openstackclient/compute/v2/server.py b/openstackclient/compute/v2/server.py
index cb12a6ffb1..ec7f212ddb 100644
--- a/openstackclient/compute/v2/server.py
+++ b/openstackclient/compute/v2/server.py
@@ -175,7 +175,7 @@ class AddServerSecurityGroup(command.Command):
             parsed_args.group,
         )
 
-        server.add_security_group(security_group)
+        server.add_security_group(security_group.name)
         return