diff --git a/Casks/freefilesync.rb b/Casks/freefilesync.rb
index 066ceb9f999..539923b4dc0 100644
--- a/Casks/freefilesync.rb
+++ b/Casks/freefilesync.rb
@@ -4,6 +4,7 @@ class Freefilesync < Cask
 
   url "http://www.fosshub.com/download/FreeFileSync_#{version}_Mac_OS_X_64-bit.zip", :referer => 'http://www.fosshub.com/FreeFileSync.html'
   homepage 'http://freefilesync.sourceforge.net/'
+  license :oss
 
   app 'FreeFileSync.app'
   app 'RealtimeSync.app'