diff --git a/lib/paperclip/storage/delayed_upload.rb b/lib/paperclip/storage/delayed_upload.rb
index 4547fa1..0e8d257 100644
--- a/lib/paperclip/storage/delayed_upload.rb
+++ b/lib/paperclip/storage/delayed_upload.rb
@@ -15,8 +15,8 @@ module Paperclip
           args = [
             instance.class.name,
             instance.id,
-            attachment.class.attachment_name,
-            store_id
+            attachment.class.attachment_name.to_s,
+            store_id.to_s # args must be serializable to json without type changes thus strings only
           ]
 
           delay.present? ? perform_in(delay, *args) : perform_async(*args)