diff --git a/nova/api/openstack/compute/security_groups.py b/nova/api/openstack/compute/security_groups.py
index b10308393f43..6ee5ee528a95 100644
--- a/nova/api/openstack/compute/security_groups.py
+++ b/nova/api/openstack/compute/security_groups.py
@@ -369,7 +369,9 @@ class SecurityGroupRulesController(SecurityGroupControllerBase,
             raise exc.HTTPBadRequest(explanation=exp.format_message())
 
 
-class ServerSecurityGroupController(SecurityGroupControllerBase):
+class ServerSecurityGroupController(
+    SecurityGroupControllerBase, wsgi.Controller
+):
 
     @wsgi.expected_errors(404)
     def index(self, req, server_id):