diff --git a/Formula/mongodb.rb b/Formula/mongodb.rb
index e3790d8ea0e..95e808177d2 100644
--- a/Formula/mongodb.rb
+++ b/Formula/mongodb.rb
@@ -1,4 +1,5 @@
 require 'formula'
+require 'hardware'
 
 class Mongodb <Formula
   homepage 'http://www.mongodb.org/'