diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index e94580951..28cce6e1d 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -29,7 +29,7 @@ class AttachmentsController < ApplicationController
   end
 
   def old_url
-    redirect_to "#{EduSetting.get("main_web_site_url")}/attachments/send_file/#{params[:id]}"
+    redirect_to "#{EduSetting.get("host_main_site")}/attachments/send_file/#{params[:id]}"
   end