diff --git a/config/services.yml b/config/services.yml
index 78fde58..98f8e21 100644
--- a/config/services.yml
+++ b/config/services.yml
@@ -2,12 +2,12 @@ services:
     boardtools.cronstatus.listener:
         class: boardtools\cronstatus\event\listener
         arguments:
-            - @config
-            - @controller.helper
-            - @user
-            - @template
-            - @dbal.conn
-            - @cron.manager
-            - @dispatcher
+            - '@config'
+            - '@controller.helper'
+            - '@user'
+            - '@template'
+            - '@dbal.conn'
+            - '@cron.manager'
+            - '@dispatcher'
         tags:
             - { name: event.listener }