diff --git a/Casks/default-folder-x.rb b/Casks/default-folder-x.rb
index 9aa3e35b9..5540c57fc 100644
--- a/Casks/default-folder-x.rb
+++ b/Casks/default-folder-x.rb
@@ -4,6 +4,7 @@ class DefaultFolderX < Cask
 
   url "http://www.stclairsoft.com/download/DefaultFolderX-#{version}.dmg"
   homepage 'http://www.stclairsoft.com/DefaultFolderX'
+  license :unknown
 
   caveats do
     manual_installer 'Default Folder X Installer.app'