diff --git a/inventory/service/group_vars/kerberos-kdc.yaml b/inventory/service/group_vars/kerberos-kdc.yaml
index 33fc460c88..0e1603dc08 100644
--- a/inventory/service/group_vars/kerberos-kdc.yaml
+++ b/inventory/service/group_vars/kerberos-kdc.yaml
@@ -1,3 +1,4 @@
+kerberos_kdc_realm: OPENSTACK.ORG
 iptables_extra_public_tcp_ports:
   - 88
   - 464