diff --git a/inventory/group_vars/keystone_all.yml b/inventory/group_vars/keystone_all.yml
index 9f246cde70..46141c5231 100644
--- a/inventory/group_vars/keystone_all.yml
+++ b/inventory/group_vars/keystone_all.yml
@@ -46,8 +46,7 @@ keystone_system_user_name: keystone
 
 keystone_external_ssl: "{{ openstack_external_ssl }}"
 
-keystone_cache_backend_argument: "url:{% for host in groups['memcached'] %}{{ hostvars[host]['container_address'] }}{% if not loop.last %},{% endif %}{% endfor %}:{{ memcached_port }}"
-keystone_memcached_servers: "{% for host in groups['keystone_all'] %}{{ hostvars[host]['container_address'] }}:{{ memcached_port }}{% if not loop.last %},{% endif %}{% endfor %}"
+keystone_cache_servers: "[{% for host in groups['memcached_all'] %}\"{{ hostvars[host]['container_address'] }}:{{ memcached_port }}\"{% if not loop.last %},{% endif %}{% endfor %}]"
 keystone_service_in_ldap: "{{ service_ldap_backend_enabled }}"
 
 # Ensure that the package state matches the global setting