diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 62bef8fb1..2d5149c09 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -361,7 +361,7 @@ private
 
   def login_without_softapplication
     referer = request.headers['Referer']
-    require_login unless referer =~ /softapplication/ || referer =~ /memos/
+    require_login unless referer =~ /softapplication/ || @attachment.container_type == "Memo"
   end
 
   def  renderTag