diff --git a/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb b/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
index 472cd4dad..32ab675c7 100644
--- a/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
+++ b/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
@@ -125,9 +125,7 @@ module Redmine
 
         def detach_saved_attachments
           saved_attachments.each do |attachment|
-            # TODO: use #reload instead, after upgrading to Rails 5
-            # (after_rollback is called when running transactional tests in Rails 4)
-            attachment.container = nil
+            attachment.reload
           end
         end