diff --git a/actionpack/lib/action_controller/routing/builder.rb b/actionpack/lib/action_controller/routing/builder.rb
index 5704d9d01a6459d2316cb927245b03d966a3afbb..7b888fa8d231698b1f44c502cbb8c11b5727de1f 100644
--- a/actionpack/lib/action_controller/routing/builder.rb
+++ b/actionpack/lib/action_controller/routing/builder.rb
@@ -60,12 +60,10 @@ def segment_for(string)
       # segments are passed alongside in order to distinguish between default values
       # and requirements.
       def divide_route_options(segments, options)
-        options = options.dup
+        options = options.except(:path_prefix, :name_prefix)
 
         if options[:namespace]
           options[:controller] = "#{options.delete(:namespace).sub(/\/$/, '')}/#{options[:controller]}"
-          options.delete(:path_prefix)
-          options.delete(:name_prefix)
         end
 
         requirements = (options.delete(:requirements) || {}).dup
diff --git a/actionpack/test/controller/routing_test.rb b/actionpack/test/controller/routing_test.rb
index 1eb26a7cfd5ef1a2d2158386e5720b150debb601..9699a04abbcb6cc97e31d25820c6a333d6b3d135 100644
--- a/actionpack/test/controller/routing_test.rb
+++ b/actionpack/test/controller/routing_test.rb
@@ -924,6 +924,20 @@ def test_named_route_with_default
 
     end
 
+    def test_named_route_with_name_prefix
+      rs.add_named_route :page, 'page', :controller => 'content', :action => 'show_page', :name_prefix => 'my_'
+      x = setup_for_named_route
+      assert_equal("http://named.route.test/page",
+                   x.send(:my_page_url))
+    end
+
+    def test_named_route_with_path_prefix
+      rs.add_named_route :page, 'page', :controller => 'content', :action => 'show_page', :path_prefix => 'my'
+      x = setup_for_named_route
+      assert_equal("http://named.route.test/my/page",
+                   x.send(:page_url))
+    end
+
     def test_named_route_with_nested_controller
       rs.add_named_route :users, 'admin/user', :controller => 'admin/user', :action => 'index'
       x = setup_for_named_route
@@ -2147,6 +2161,13 @@ def test_generate
       assert_equal [:x], set.extra_keys(args)
     end
 
+    def test_generate_with_path_prefix
+      set.draw { |map| map.connect ':controller/:action/:id', :path_prefix => 'my' }
+
+      args = { :controller => "foo", :action => "bar", :id => "7", :x => "y" }
+      assert_equal "/my/foo/bar/7?x=y", set.generate(args)
+    end
+
     def test_named_routes_are_never_relative_to_modules
       set.draw do |map|
         map.connect "/connection/manage/:action", :controller => 'connection/manage'