diff --git a/Casks/integrity.rb b/Casks/integrity.rb
index 6fd44f54d..48946abf6 100644
--- a/Casks/integrity.rb
+++ b/Casks/integrity.rb
@@ -4,6 +4,7 @@ class Integrity < Cask
 
   url 'http://peacockmedia.co.uk/integrity/integrity.dmg'
   homepage 'http://peacockmedia.co.uk/integrity/'
+  license :unknown
 
   app 'Integrity.app'
 end