diff --git a/Casks/little-snitch-nightly.rb b/Casks/little-snitch-nightly.rb
index 1f30fbd94..8cbb6e674 100644
--- a/Casks/little-snitch-nightly.rb
+++ b/Casks/little-snitch-nightly.rb
@@ -4,6 +4,7 @@ class LittleSnitchNightly < Cask
 
   url "http://www.obdev.at/downloads/littlesnitch/nightly/LittleSnitch-#{version}.dmg"
   homepage 'http://www.obdev.at/products/littlesnitch/index.html'
+  license :unknown
 
   caveats do
     manual_installer 'Little Snitch Installer.app'