diff --git a/activesupport/test/ts_isolated.rb b/activesupport/test/ts_isolated.rb
index cbab61a52321077f8a1c313e84a94a6200f9833c..fc1bbd6e3d04d77bd9875161422d979a36a9ef26 100644
--- a/activesupport/test/ts_isolated.rb
+++ b/activesupport/test/ts_isolated.rb
@@ -1,6 +1,6 @@
 require 'test/unit'
 require 'rbconfig'
-require 'active_support/core_ext/kernel/reporting'
+require 'lib/active_support/core_ext/kernel/reporting'
 
 class TestIsolated < Test::Unit::TestCase
   ruby = File.join(*RbConfig::CONFIG.values_at('bindir', 'RUBY_INSTALL_NAME'))