diff --git a/Casks/omniplan1.rb b/Casks/omniplan1.rb
index 5852a59e9..818849f73 100644
--- a/Casks/omniplan1.rb
+++ b/Casks/omniplan1.rb
@@ -1,4 +1,4 @@
-class Omniplan1 < Cask
+cask :v1 => 'omniplan1' do
   version '1.7'
   sha256 '62cd16d91e9833bf2fcff7f083114572e5374f5516f8127c34a2a9444b58cccf'