diff --git a/activeresource/test/abstract_unit.rb b/activeresource/test/abstract_unit.rb
index 05efac79cf..6a33040243 100644
--- a/activeresource/test/abstract_unit.rb
+++ b/activeresource/test/abstract_unit.rb
@@ -1,5 +1,6 @@
 require 'rubygems'
 require 'test/unit'
+require 'active_support'
 require 'active_support/test_case'
 
 $:.unshift "#{File.dirname(__FILE__)}/../lib"