diff --git a/activesupport/test/abstract_unit.rb b/activesupport/test/abstract_unit.rb
index 8967b54537..d640c9bc63 100644
--- a/activesupport/test/abstract_unit.rb
+++ b/activesupport/test/abstract_unit.rb
@@ -1,12 +1,12 @@
 ORIG_ARGV = ARGV.dup
-root = File.expand_path('../../..', __FILE__)
+
 begin
-  require "#{root}/vendor/gems/environment"
+  require File.expand_path('../../../vendor/gems/environment', __FILE__)
 rescue LoadError
-  $:.unshift("#{root}/activesupport/lib")
-  $:.unshift("#{root}/activerecord/lib")
 end
 
+$:.unshift(File.dirname(__FILE__) + '/../lib')
+
 require 'test/unit'
 require 'mocha'