diff --git a/Casks/firefox-de.rb b/Casks/firefox-de.rb
index 544b7ddf9..07aa20bd1 100644
--- a/Casks/firefox-de.rb
+++ b/Casks/firefox-de.rb
@@ -1,5 +1,5 @@
 class FirefoxDe < Cask
-  version 'latest'
+  version :latest
   sha256 :no_check
 
   url 'https://download.mozilla.org/?product=firefox-latest&os=osx&lang=de'