diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index e91c4bc40..5e409decd 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -115,7 +115,7 @@ class Attachment < ApplicationRecord
 
   def become_history
     history = self.attachment_histories.first
-    new_attachment_history = AttachmentHistory.new(self.attributes.except("id", "resource_bank_id", "unified_setting", "course_second_category_id", "delay_publish").merge(
+    new_attachment_history = AttachmentHistory.new(self.attributes.except("id", "resource_bank_id", "unified_setting", "course_second_category_id", "delay_publish", "link").merge(
         attachment_id: self.id,
         version: history.nil? ? 1 :  history.version + 1,
     ))