diff --git a/classes/cluster/os-ha-ovs/openstack/init.yml b/classes/cluster/os-ha-ovs/openstack/init.yml
index da3da94..6fc3d30 100644
--- a/classes/cluster/os-ha-ovs/openstack/init.yml
+++ b/classes/cluster/os-ha-ovs/openstack/init.yml
@@ -124,6 +124,7 @@
     horizon_identity_encryption: none
     horizon_identity_version: 2
     nginx_proxy_openstack_api_proxy_host: ${_param:cluster_vip_address}
+    loopback_device_size: 20
   linux:
     network:
       host: