diff --git a/Casks/virtualbox43691406.rb b/Casks/virtualbox43691406.rb
index 43ec43681..65e28d409 100644
--- a/Casks/virtualbox43691406.rb
+++ b/Casks/virtualbox43691406.rb
@@ -1,4 +1,4 @@
-class Virtualbox43691406 < Cask
+cask :v1 => 'virtualbox43691406' do
   version '4.3.6-91406'
   sha256 '60678b7cc7dc741b800cfc99c7ff73a185c548af877071eb82422f354e76bca2'