diff --git a/Casks/webkit-nightly.rb b/Casks/webkit-nightly.rb
index 6a987def4..39b92be32 100644
--- a/Casks/webkit-nightly.rb
+++ b/Casks/webkit-nightly.rb
@@ -1,4 +1,4 @@
-class WebkitNightly < Cask
+cask :v1 => 'webkit-nightly' do
   version 'r159487'
   sha256 '6d59673fdac0c380f66c1da6ae5742377b68add2f0bb33737bd7e1cec7ba821c'