diff --git a/social_auth.services.yml b/social_auth.services.yml
index cc90582..deae7f7 100644
--- a/social_auth.services.yml
+++ b/social_auth.services.yml
@@ -2,10 +2,10 @@ services:
   social_auth.user_manager:
     class: Drupal\social_auth\SocialAuthUserManager
     arguments:
-      - @config.factory
-      - @logger.factory
-      - @entity_type.manager
-      - @entity_field.manager
-      - @token
-      - @string_translation
-      - @transliteration
+      - '@config.factory'
+      - '@logger.factory'
+      - '@entity_type.manager'
+      - '@entity_field.manager'
+      - '@token'
+      - '@string_translation'
+      - '@transliteration'