diff --git a/Casks/growlvoice.rb b/Casks/growlvoice.rb
index 52af378c966..75a3f507eee 100644
--- a/Casks/growlvoice.rb
+++ b/Casks/growlvoice.rb
@@ -4,6 +4,8 @@ cask :v1 => 'growlvoice' do
 
   url "http://www.growlvoice.com/trials/growlvoice-#{version}.zip"
   name 'GrowlVoice'
+  appcast 'http://www.growlvoice.com/trials/appcast.xml',
+          :sha256 => 'fe1d26972a9184bbe452eba1334f74e22b55fde54975a835c118532e243f7e92'
   homepage 'http://www.growlvoice.com/'
   license :unknown    # todo: change license and remove this comment; ':unknown' is a machine-generated placeholder