diff --git a/Casks/master-key.rb b/Casks/master-key.rb
index a00ee329d..f1939370e 100644
--- a/Casks/master-key.rb
+++ b/Casks/master-key.rb
@@ -1,4 +1,4 @@
-class MasterKey < Cask
+cask :v1 => 'master-key' do
   version :latest
   sha256 :no_check