diff --git a/samples/deployments/existing-keystone-v3.json b/samples/deployments/existing-keystone-v3.json
index 6d7bcfc3..ecdeaecb 100644
--- a/samples/deployments/existing-keystone-v3.json
+++ b/samples/deployments/existing-keystone-v3.json
@@ -7,6 +7,7 @@
         "username": "admin",
         "password": "myadminpass",
         "user_domain_name": "admin",
+        "admin_domain_name": "default",
         "project_name": "admin",
         "project_domain_name": "admin",
     },