diff --git a/Casks/httpscoop.rb b/Casks/httpscoop.rb
index 06421e10f..704dcc894 100644
--- a/Casks/httpscoop.rb
+++ b/Casks/httpscoop.rb
@@ -3,7 +3,8 @@ class Httpscoop < Cask
   sha256 'cf3d9767a86e996ecbb3c7abe7e1b43eef985d6125bb3c6680f9246e4db9214e'
 
   url "https://s3.amazonaws.com/Trueridge/HTTPScoop_#{version}.dmg"
-  appcast 'http://www.tuffcode.com/releases/httpscoop-appcast.xml'
+  appcast 'http://www.tuffcode.com/releases/httpscoop-appcast.xml',
+          :sha256 => 'f3d7449544aa64c7709cdb8c5ccd93f2a056550add5fc7493fc402b2c515c5cb'
   homepage 'http://www.tuffcode.com'
   license :unknown