diff --git a/app/services/notification_recipient_service.rb b/app/services/notification_recipient_service.rb
index 540e568fed2..cfc1fab210a 100644
--- a/app/services/notification_recipient_service.rb
+++ b/app/services/notification_recipient_service.rb
@@ -48,8 +48,8 @@ module NotificationRecipientService
         @recipients ||= []
       end
 
-      def <<(arg)
-        users, type = arg
+      def <<(pair)
+        users, type = pair
 
         if users.is_a?(ActiveRecord::Relation)
           users = users.includes(:notification_settings)