diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index 21c52b0..aea937d 100644
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -6,5 +6,5 @@ services:
     anca_rebeca_full_calendar.service.calendar:
         class: AncaRebeca\FullCalendarBundle\Service\Calendar
         arguments:
-            - @anca_rebeca_full_calendar.service.serializer
-            - @event_dispatcher
+            - '@anca_rebeca_full_calendar.service.serializer'
+            - '@event_dispatcher'