diff --git a/ansible/roles/horizon/tasks/start.yml b/ansible/roles/horizon/tasks/start.yml
index 77be5d0339..e94bc5d5b2 100644
--- a/ansible/roles/horizon/tasks/start.yml
+++ b/ansible/roles/horizon/tasks/start.yml
@@ -14,6 +14,7 @@
       ENABLE_SAHARA: "{{ 'yes' if enable_sahara | bool else 'no' }}"
       ENABLE_SEARCHLIGHT: "{{ 'yes' if enable_searchlight | bool else 'no' }}"
       ENABLE_SENLIN: "{{ 'yes' if enable_senlin | bool else 'no' }}"
+      ENABLE_SOLUM: "{{ 'yes' if enable_solum | bool else 'no' }}"
       ENABLE_TROVE: "{{ 'yes' if enable_trove | bool else 'no' }}"
       ENABLE_WATCHER: "{{ 'yes' if enable_watcher | bool else 'no' }}"
     volumes: