diff --git a/ansible/roles/horizon/tasks/start.yml b/ansible/roles/horizon/tasks/start.yml
index e6a1b8e84e..e50e57c16c 100644
--- a/ansible/roles/horizon/tasks/start.yml
+++ b/ansible/roles/horizon/tasks/start.yml
@@ -15,6 +15,7 @@
       ENABLE_SEARCHLIGHT: "{{ 'yes' if enable_searchlight | bool else 'no' }}"
       ENABLE_SENLIN: "{{ 'yes' if enable_senlin | bool else 'no' }}"
       ENABLE_TROVE: "{{ 'yes' if enable_trove | bool else 'no' }}"
+      ENABLE_WATCHER: "{{ 'yes' if enable_watcher | bool else 'no' }}"
     volumes:
       - "{{ node_config_directory }}/horizon/:{{ container_config_directory }}/:ro"
       - "/etc/localtime:/etc/localtime:ro"