diff --git a/app/models/ticket.rb b/app/models/ticket.rb
index 172ceec6f..29f0bf515 100644
--- a/app/models/ticket.rb
+++ b/app/models/ticket.rb
@@ -111,6 +111,9 @@ class Ticket < ActiveRecord::Base
       end
     end
 
+  class Number
+  end
+
   class Flag < ActiveRecord::Base
   end