diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index ca943a27df..6ad5eae3a6 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -18,6 +18,7 @@ class Formula
 
   attr_reader :name, :path, :homepage, :build
   attr_reader :stable, :bottle, :devel, :head, :active_spec
+  attr_reader :revision
 
   # The current working directory during builds and tests.
   # Will only be non-nil inside #stage and #test.
@@ -34,6 +35,7 @@ class Formula
     @name = name
     @path = path
     @homepage = self.class.homepage
+    @revision = self.class.revision || 0
 
     set_spec :stable
     set_spec :devel
@@ -662,7 +664,7 @@ class Formula
   class << self
 
     attr_reader :keg_only_reason, :cc_failures
-    attr_rw :homepage, :plist_startup, :plist_manual
+    attr_rw :homepage, :plist_startup, :plist_manual, :revision
 
     def specs
       @specs ||= [stable, devel, head, bottle].freeze