diff --git a/Casks/omniplan1.rb b/Casks/omniplan1.rb
deleted file mode 100644
index 300181356..000000000
--- a/Casks/omniplan1.rb
+++ /dev/null
@@ -1,11 +0,0 @@
-cask 'omniplan1' do
-  version '1.7'
-  sha256 '62cd16d91e9833bf2fcff7f083114572e5374f5516f8127c34a2a9444b58cccf'
-
-  url "http://www.omnigroup.com/ftp/pub/software/MacOSX/10.4/OmniPlan-#{version}.dmg"
-  name 'OmniPlan'
-  homepage 'https://www.omnigroup.com/omniplan/'
-  license :unknown
-
-  app 'OmniPlan.app'
-end