1 files changed, 5 insertions, 4 deletions
diff --git a/actionpack/lib/action_dispatch/routing/url_for.rb b/actionpack/lib/action_dispatch/routing/url_for.rb
index afbb2ecf16..be5edcc120 100644
--- a/actionpack/lib/action_dispatch/routing/url_for.rb
+++ b/actionpack/lib/action_dispatch/routing/url_for.rb
@@ -102,14 +102,15 @@ module ActionDispatch
 
       def url_options
         @url_options ||= begin
-          opts = self.class.default_url_options
-          opts.merge(:script_name => _router.script_name) if respond_to?(:_router)
-          opts
+          # self.class does not respond to default_url_options when the helpers are extended
+          # onto a singleton
+          self.class.respond_to?(:default_url_options) ? self.class.default_url_options : {}
         end
       end
 
       def url_options=(options)
-        @url_options = options
+        defaults = self.class.respond_to?(:default_url_options) ? self.class.default_url_options : {}
+        @url_options = defaults.merge(options)
       end
 
       # def merge_options(options) #:nodoc: