diff --git a/Casks/omnioutliner3.rb b/Casks/omnioutliner3.rb
index 25f794af2..c027d4de6 100644
--- a/Casks/omnioutliner3.rb
+++ b/Casks/omnioutliner3.rb
@@ -1,4 +1,4 @@
-class Omnioutliner3 < Cask
+cask :v1 => 'omnioutliner3' do
   version :latest
   sha256 :no_check