diff --git a/Casks/nally.rb b/Casks/nally.rb
index 3e19619c6..eccc5ac98 100644
--- a/Casks/nally.rb
+++ b/Casks/nally.rb
@@ -4,6 +4,7 @@ class Nally < Cask
 
   url "https://yllan.github.com/nally/download/Nally-#{version}.app.zip"
   homepage 'http://yllan.org/app/Nally/'
+  license :oss
 
   app 'Nally.app'
 end