diff --git a/playbooks/groups/overcloud-config.yml b/playbooks/groups/overcloud-config.yml
index 51edf3a7f5..6cc29fa60f 100644
--- a/playbooks/groups/overcloud-config.yml
+++ b/playbooks/groups/overcloud-config.yml
@@ -22,7 +22,7 @@
             project_domain_name: Default
             user_domain_name: Default
         auth_type: password
-        region_name: RegionOne
+        region_name: regionOne
         auth_version: 3
 
   - name: create non-standard flavor