diff --git a/Casks/kindle-previewer.rb b/Casks/kindle-previewer.rb
index 15e3b2a3281..d1c5957bac7 100644
--- a/Casks/kindle-previewer.rb
+++ b/Casks/kindle-previewer.rb
@@ -1,5 +1,5 @@
 class KindlePreviewer < Cask
-  version 'latest'
+  version :latest
   sha256 :no_check
 
   url 'https://kindlepreviewer.s3.amazonaws.com/KindlePreviewer.zip'