diff --git a/railties/test/rack_logger_test.rb b/railties/test/rack_logger_test.rb
index cfd2c5b50a1c00fe786a09d71342e2d0faddc5fe..635a8a88655a78fdd40f36a29ca35e14f82b313d 100644
--- a/railties/test/rack_logger_test.rb
+++ b/railties/test/rack_logger_test.rb
@@ -1,3 +1,4 @@
+require 'abstract_unit'
 require 'active_support/testing/autorun'
 require 'active_support/test_case'
 require 'rails/rack/logger'