diff --git a/roles/keystone/vars/main.yml b/roles/keystone/vars/main.yml
index 1cc61ef..4ed3565 100644
--- a/roles/keystone/vars/main.yml
+++ b/roles/keystone/vars/main.yml
@@ -82,7 +82,7 @@
         <Location /v3/auth/OS-FEDERATION/identity_providers/{{ domain.name }}/protocols/openid/websso>
           Require valid-user
           AuthType openid-connect
-          OIDCDiscoverURL {{ keystone_oidc_redirect_uri }}?iss={{ domain | urlencoded_issuer_from_domain }}
+          OIDCDiscoverURL {{ keystone_oidc_redirect_uri }}?iss={{ domain | vexxhost.atmosphere.urlencoded_issuer_from_domain }}
         </Location>
         {% endfor %}
       </VirtualHost>