diff --git a/spec/test_helper.rb b/spec/test_helper.rb
index <HASH>..<HASH> 100644
--- a/spec/test_helper.rb
+++ b/spec/test_helper.rb
@@ -2,7 +2,7 @@
 require 'rubygems'
 
 # To get the specs to run on Ruby 1.9.x.
-gem 'test-unit',                  '= 2.0.2'
+gem 'test-unit',                  '= 1.2.3'
 gem 'activesupport',              '>= 2.3.3'
 gem 'actionpack',                 '>= 2.3.3'
 gem 'rspec',                      '>= 1.2.6'
Force test-unit <I> - test-unit <I>.x causes problems.