diff --git a/Casks/x-quartz.rb b/Casks/x-quartz.rb
index 6b4323c7f..f63853f60 100644
--- a/Casks/x-quartz.rb
+++ b/Casks/x-quartz.rb
@@ -3,4 +3,5 @@ class XQuartz < Cask
   homepage 'http://xquartz.macosforge.org/'
   version '2.7.4'
   sha1 '98b2ca8580046d5b91250c5a244c8182437dc9d7'
+  install 'XQuartz.pkg'
 end