diff --git a/Casks/vine-server.rb b/Casks/vine-server.rb
index f3ce44a24..13af44f0f 100644
--- a/Casks/vine-server.rb
+++ b/Casks/vine-server.rb
@@ -4,6 +4,7 @@ class VineServer < Cask
 
   url "http://www.testplant.com/downloads/Vine/VineServer#{version}.dmg"
   homepage 'http://www.testplant.com/products/vine/vine-server/'
+  license :unknown
 
   app 'Vine Server.app'
 end