diff --git a/actionpack/test/controller/routing_test.rb b/actionpack/test/controller/routing_test.rb
index d39e4d98abfdc..cfba8fb976524 100644
--- a/actionpack/test/controller/routing_test.rb
+++ b/actionpack/test/controller/routing_test.rb
@@ -1673,10 +1673,13 @@ class RoutingTest < Test::Unit::TestCase
   
   def test_possible_controllers
     true_controller_paths = ActionController::Routing.controller_paths
-    
+
     ActionController::Routing.use_controllers! nil
-    Object.send(:const_set, :RAILS_ROOT, File.dirname(__FILE__) + '/controller_fixtures')
-    
+
+    silence_warnings do
+      Object.send(:const_set, :RAILS_ROOT, File.dirname(__FILE__) + '/controller_fixtures')
+    end
+
     ActionController::Routing.controller_paths = [
       RAILS_ROOT, RAILS_ROOT + '/app/controllers', RAILS_ROOT + '/vendor/plugins/bad_plugin/lib'
     ]
@@ -1734,4 +1737,4 @@ def test_normalize_windows_paths
     assert_equal %w(vendor\\rails\\railties\\builtin\\rails_info vendor\\rails\\actionpack\\lib app\\controllers app\\helpers app\\models lib .), paths
   end
   
-end
\ No newline at end of file
+end