diff --git a/Library/Homebrew/cmd/test.rb b/Library/Homebrew/cmd/test.rb
index 616da440ba..95736f3f05 100644
--- a/Library/Homebrew/cmd/test.rb
+++ b/Library/Homebrew/cmd/test.rb
@@ -1,6 +1,7 @@
 require "extend/ENV"
 require "formula_assertions"
 require "sandbox"
+require "timeout"
 
 module Homebrew