diff --git a/Casks/firefox-fr.rb b/Casks/firefox-fr.rb
index 02a0535d7..6e6cfc6de 100644
--- a/Casks/firefox-fr.rb
+++ b/Casks/firefox-fr.rb
@@ -4,6 +4,7 @@ class FirefoxFr < Cask
 
   url 'https://download.mozilla.org/?product=firefox-latest&os=osx&lang=fr'
   homepage 'http://www.mozilla.org/fr/firefox/new/'
+  license :oss
 
   app 'Firefox.app'
 end