diff --git a/actionpack/lib/action_dispatch/routing/routes_proxy.rb b/actionpack/lib/action_dispatch/routing/routes_proxy.rb
index 68602e1eb2..040ea04046 100644
--- a/actionpack/lib/action_dispatch/routing/routes_proxy.rb
+++ b/actionpack/lib/action_dispatch/routing/routes_proxy.rb
@@ -8,9 +8,9 @@ class RoutesProxy #:nodoc:
       attr_accessor :scope, :routes
       alias :_routes :routes
 
-      def initialize(routes, scope, helpers=nil)
+      def initialize(routes, scope, helpers)
         @routes, @scope = routes, scope
-        @helpers = helpers || routes.url_helpers
+        @helpers = helpers
       end
 
       def url_options
diff --git a/actionview/test/activerecord/polymorphic_routes_test.rb b/actionview/test/activerecord/polymorphic_routes_test.rb
index 8e1ed2776d..6b51775cf3 100644
--- a/actionview/test/activerecord/polymorphic_routes_test.rb
+++ b/actionview/test/activerecord/polymorphic_routes_test.rb
@@ -113,7 +113,7 @@ def test_symbol_with_options
 
   def test_passing_routes_proxy
     with_namespaced_routes(:blog) do
-      proxy = ActionDispatch::Routing::RoutesProxy.new(_routes, self)
+      proxy = ActionDispatch::Routing::RoutesProxy.new(_routes, self, _routes.url_helpers)
       @blog_post.save
       assert_url "http://example.com/posts/#{@blog_post.id}", [proxy, @blog_post]
     end