diff --git a/ansible/roles/magnum/tasks/register.yml b/ansible/roles/magnum/tasks/register.yml
index 6a0c379b5d..4d615f3267 100644
--- a/ansible/roles/magnum/tasks/register.yml
+++ b/ansible/roles/magnum/tasks/register.yml
@@ -39,6 +39,7 @@
       description: "Owns users and projects created by magnum"
       auth: "{{ openstack_magnum_auth }}"
       endpoint_type: "{{ openstack_interface }}"
+  register: trustee_domain
   run_once: True
 
 - name: Creating Magnum trustee user