diff --git a/mistral/utils/openstack/keystone.py b/mistral/utils/openstack/keystone.py
index 7684539dd..b650fed9b 100644
--- a/mistral/utils/openstack/keystone.py
+++ b/mistral/utils/openstack/keystone.py
@@ -120,8 +120,10 @@ def _admin_client(trust_id=None):
         kwargs = {}
 
         if trust_id:
-            # Remove project_name and project_id, since we need a trust scoped
-            # auth object
+            # Remove domain_id, domain_name, project_name and project_id,
+            # since we need a trust scoped auth object
+            kwargs['domain_id'] = None
+            kwargs['domain_name'] = None
             kwargs['project_name'] = None
             kwargs['project_domain_name'] = None
             kwargs['project_id'] = None