diff --git a/Casks/firefox-cn.rb b/Casks/firefox-cn.rb
index 3ba3c1f48..e46fd4e65 100644
--- a/Casks/firefox-cn.rb
+++ b/Casks/firefox-cn.rb
@@ -1,4 +1,4 @@
-class FirefoxCn < Cask
+cask :v1 => 'firefox-cn' do
   version :latest
   sha256 :no_check