diff --git a/Library/Homebrew/test/test_ENV.rb b/Library/Homebrew/test/test_ENV.rb
index da3a9d6af2..276d9ec92f 100644
--- a/Library/Homebrew/test/test_ENV.rb
+++ b/Library/Homebrew/test/test_ENV.rb
@@ -1,5 +1,6 @@
 require 'testing_env'
 require 'utils'
+require 'hardware'
 require 'extend/ENV'
 ENV.extend(HomebrewEnvExtension)