diff --git a/activesupport/test/core_ext/object_and_class_ext_test.rb b/activesupport/test/core_ext/object_and_class_ext_test.rb
index 0f454fdd951220abb9a0aff13aa1b51b1d441b77..f692eb4fa30eab860bc94db8bd159a9f51a983d0 100644
--- a/activesupport/test/core_ext/object_and_class_ext_test.rb
+++ b/activesupport/test/core_ext/object_and_class_ext_test.rb
@@ -1,7 +1,6 @@
 require 'abstract_unit'
 require 'active_support/time'
 require 'active_support/core_ext/object'
-require 'active_support/core_ext/class/subclasses'
 
 class ObjectTests < ActiveSupport::TestCase
   class DuckTime