diff --git a/Casks/mou.rb b/Casks/mou.rb
index 414b257f7667..6f8ac5d6c939 100644
--- a/Casks/mou.rb
+++ b/Casks/mou.rb
@@ -2,5 +2,5 @@ class Mou < Cask
   url 'http://mouapp.com/download/Mou.zip'
   version 'latest'
   homepage 'http://mouapp.com/'
-  sha1 'e69bc2bbdadea6a2929032506085b6e9501a7fb9'
+  no_checksum
 end