diff --git a/app/models/issue.rb b/app/models/issue.rb
index ad9218bbc1..cc9159d537 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -392,7 +392,7 @@ class Issue < ActiveRecord::Base
   def attachment_removed(obj)
     init_journal(User.current)
     create_journal
-    last_journal.update_attribute(:changed_data, {"attachments_" + obj.id.to_s => [obj.filename, nil]}.to_yaml)
+    last_journal.update_attribute(:changed_data, {"attachments_" + obj.id.to_s => [obj.filename, nil]})
   end
 
   # Return true if the issue is closed, otherwise false