diff --git a/vars/services.yml b/vars/services.yml
index ecec740..f10a775 100644
--- a/vars/services.yml
+++ b/vars/services.yml
@@ -170,7 +170,7 @@ service_config:
         region: eu-central-003
         regionendpoint: https://s3.eu-central-003.backblazeb2.com
         bucket: kadet-docker
-  portainer: ~
-  system: ~
+  portainer: {}
+  system: {}
 www_data_users:
   - vagrant