diff --git a/devstack/gate_hook.sh b/devstack/gate_hook.sh
index 5dd9996f5..4bb649b74 100644
--- a/devstack/gate_hook.sh
+++ b/devstack/gate_hook.sh
@@ -47,6 +47,7 @@ notification_driver = messagingv2
 [notifications]
 versioned_notifications_topics = versioned_notifications,vitrage_notifications
 notification_driver = messagingv2
+notification_format = both
 
 [[post-config|\$NEUTRON_CONF]]
 [DEFAULT]
diff --git a/devstack/gate_hook_mock.sh b/devstack/gate_hook_mock.sh
index 4e7e4987a..5a7de1a08 100644
--- a/devstack/gate_hook_mock.sh
+++ b/devstack/gate_hook_mock.sh
@@ -35,6 +35,7 @@ notification_driver = messagingv2
 [notifications]
 versioned_notifications_topics = versioned_notifications,vitrage_notifications
 notification_driver = messagingv2
+notification_format = both
 
 [[post-config|\$CINDER_CONF]]
 [DEFAULT]