diff --git a/activesupport/test/ordered_options_test.rb b/activesupport/test/ordered_options_test.rb
index 0eee991e20..3526c7a366 100644
--- a/activesupport/test/ordered_options_test.rb
+++ b/activesupport/test/ordered_options_test.rb
@@ -1,4 +1,5 @@
 require 'abstract_unit'
+require 'active_support/ordered_options'
 
 class OrderedOptionsTest < ActiveSupport::TestCase
   def test_usage