diff --git a/railties/test/application/rackup_test.rb b/railties/test/application/rackup_test.rb
index 3790de721ca10b023ff705f38078a553b22ce4f4..863950c04fac6bc819a61bad0cf525bd605588c2 100644
--- a/railties/test/application/rackup_test.rb
+++ b/railties/test/application/rackup_test.rb
@@ -35,7 +35,7 @@ def setup
     # keep it working for now
     test "deprecated ActionController::Dispatcher still works" do
       rackup
-      assert_kind_of?  Rails::Application, ActionController::Dispatcher.new
+      assert_kind_of Rails::Application, ActionController::Dispatcher.new
     end
 
     test "the config object is available on the application object" do