diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index acdd564ba6..8e774ba852 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -1,5 +1,6 @@
 require 'extend/pathname'
 require 'formula_lock'
+require 'ostruct'
 
 class Keg < Pathname
   def initialize path