diff --git a/ansible/roles/horizon/tasks/start.yml b/ansible/roles/horizon/tasks/start.yml
index 3dd0945221..7cc39c488d 100644
--- a/ansible/roles/horizon/tasks/start.yml
+++ b/ansible/roles/horizon/tasks/start.yml
@@ -6,6 +6,7 @@
     image: "{{ horizon_image_full }}"
     name: "horizon"
     environment:
+      ENABLE_IRONIC: "{{ 'yes' if enable_ironic | bool else 'no' }}"
       ENABLE_MANILA: "{{ 'yes' if  enable_manila | bool else 'no' }}"
       ENABLE_NEUTRON_LBAAS: "{{ 'yes' if  enable_neutron_lbaas | bool else 'no' }}"
     volumes: