diff --git a/keystone/client/service/congress.yml b/keystone/client/service/congress.yml
index 49e8337..a6599d5 100644
--- a/keystone/client/service/congress.yml
+++ b/keystone/client/service/congress.yml
@@ -1,3 +1,5 @@
+classes:
+- system.keystone.client.v3.service.congress
 parameters:
   _param:
     cluster_public_protocol: https