diff --git a/Library/Homebrew/test/testball.rb b/Library/Homebrew/test/testball.rb
index e4ece70fdf..d2686ba859 100644
--- a/Library/Homebrew/test/testball.rb
+++ b/Library/Homebrew/test/testball.rb
@@ -1,7 +1,7 @@
 require 'formula'
 
 class TestBall < Formula
-  def initialize(name="test_ball", path=nil)
+  def initialize(name="test_ball", path=Pathname.new(__FILE__).expand_path)
     self.class.instance_eval do
       stable.url "file://#{TEST_DIRECTORY}/tarballs/testball-0.1.tbz"
       stable.sha1 "482e737739d946b7c8cbaf127d9ee9c148b999f5"