diff --git a/Formula/llvm.rb b/Formula/llvm.rb
index dc83fcbb63bd7..96d54ebeaaff5 100644
--- a/Formula/llvm.rb
+++ b/Formula/llvm.rb
@@ -20,6 +20,7 @@ def message
 class Llvm < Formula
   desc "Next-gen compiler infrastructure"
   homepage "http://llvm.org/"
+  revision 1
 
   stable do
     url "http://releases.llvm.org/4.0.0/llvm-4.0.0.src.tar.xz"