diff --git a/Library/Homebrew/test/test_cleaner.rb b/Library/Homebrew/test/test_cleaner.rb
index ff3012ac52..a55a308876 100644
--- a/Library/Homebrew/test/test_cleaner.rb
+++ b/Library/Homebrew/test/test_cleaner.rb
@@ -1,5 +1,6 @@
 require 'testing_env'
 require 'cleaner'
+require 'formula'
 
 class CleanerTestBall < Formula
   url "file:///#{TEST_FOLDER}/tarballs/testball-0.1.tbz"