diff --git a/Casks/uncrustifyx.rb b/Casks/uncrustifyx.rb
index e2db92f9b..15a3fae63 100644
--- a/Casks/uncrustifyx.rb
+++ b/Casks/uncrustifyx.rb
@@ -3,7 +3,8 @@ class Uncrustifyx < Cask
   sha256 '017c0781ce05db59c1a3fe52a140166df55aa2d87286a7cf5ba5e3eb6b06c7df'
 
   url "https://github.com/ryanmaxwell/UncrustifyX/releases/download/#{version}/UncrustifyX-#{version}.zip"
-  appcast 'https://raw.github.com/ryanmaxwell/uncrustifyx/appcast/uncrustifyx-appcast.xml'
+  appcast 'https://raw.github.com/ryanmaxwell/uncrustifyx/appcast/uncrustifyx-appcast.xml',
+          :sha256 => 'b81877f4c038cccd6849ed1fa5f76e3a705d681165865a4238b43d034f028bba'
   homepage 'https://github.com/ryanmaxwell/UncrustifyX'
   license :mit