diff --git a/actionpack/lib/action_controller/test_process.rb b/actionpack/lib/action_controller/test_process.rb
index 0afe3f82fc..096ccf76d2 100644
--- a/actionpack/lib/action_controller/test_process.rb
+++ b/actionpack/lib/action_controller/test_process.rb
@@ -112,6 +112,7 @@ module ActionController #:nodoc:
           path_parameters[key.to_s] = value
         end
       end
+      @parameters = nil # reset TestRequest#parameters to use the new path_parameters
     end                        
     
     def recycle!