diff --git a/railties/lib/rails/test_unit/minitest_plugin.rb b/railties/lib/rails/test_unit/minitest_plugin.rb
index ab71298509..5552779ef1 100644
--- a/railties/lib/rails/test_unit/minitest_plugin.rb
+++ b/railties/lib/rails/test_unit/minitest_plugin.rb
@@ -48,4 +48,5 @@ module Minitest
   mattr_accessor(:run_with_rails_extension) { false }
 end
 
+Minitest.load_plugins
 Minitest.extensions << 'rails'