diff --git a/ansible/roles/common/defaults/main.yml b/ansible/roles/common/defaults/main.yml
index d33420e177..732b33c8e9 100644
--- a/ansible/roles/common/defaults/main.yml
+++ b/ansible/roles/common/defaults/main.yml
@@ -32,7 +32,7 @@ common_services:
     container_name: cron
     image: "{{ cron_image_full }}"
     environment:
-      DUMMY_ENVIRONMENT:
+      DUMMY_ENVIRONMENT: kolla_useless_env
     volumes:
       - "{{ node_config_directory }}/cron/:{{ container_config_directory }}/:ro"
       - "/etc/localtime:/etc/localtime:ro"