diff --git a/Casks/aerofs.rb b/Casks/aerofs.rb
index 338d80f38..501e41478 100644
--- a/Casks/aerofs.rb
+++ b/Casks/aerofs.rb
@@ -4,6 +4,7 @@ class Aerofs < Cask
 
   url "https://dsy5cjk52fz4a.cloudfront.net/AeroFSInstall-#{version}.dmg"
   homepage 'https://www.aerofs.com/'
+  license :unknown
 
   app 'AeroFS.app'
 end