diff --git a/Casks/apptivate.rb b/Casks/apptivate.rb
index 7afc2230a..190d92132 100644
--- a/Casks/apptivate.rb
+++ b/Casks/apptivate.rb
@@ -4,6 +4,7 @@ class Apptivate < Cask
 
   url 'http://www.apptivateapp.com/resources/Apptivate.app.zip'
   homepage 'http://www.apptivateapp.com'
+  license :unknown
 
   app 'Apptivate.app'
 end