diff --git a/Formula/cairo.rb b/Formula/cairo.rb
index 258e32f88e9..9dc979d4fb8 100644
--- a/Formula/cairo.rb
+++ b/Formula/cairo.rb
@@ -5,7 +5,7 @@ class Cairo < Formula
   url 'http://cairographics.org/releases/cairo-1.12.2.tar.xz'
   sha256 'b786bc4a70542bcb09f2d9d13e5e6a0c86408cbf6d1edde5f0de807eecf93f96'
 
-  keg_only :when_xquartz_installed
+  keg_only unless MacOS.version >= :mountain_lion
 
   option :universal
   option 'without-x', 'Build without X11 support'