diff --git a/actionpack/lib/action_dispatch/routing/url_for.rb b/actionpack/lib/action_dispatch/routing/url_for.rb
index 12ae2456d6..d75bb1c2de 100644
--- a/actionpack/lib/action_dispatch/routing/url_for.rb
+++ b/actionpack/lib/action_dispatch/routing/url_for.rb
@@ -147,16 +147,7 @@ module ActionDispatch
         when nil
           _routes.url_for(url_options.symbolize_keys)
         when Hash
-          symbolized = {}
-          options.keys.each do |k|
-            sym = k.to_sym
-            symbolized[sym] = options[k] unless symbolized.has_key?(sym)
-          end
-          url_options.keys.each do |k|
-            sym = k.to_sym
-            symbolized[sym] = url_options[k] unless symbolized.has_key?(sym)
-          end
-          _routes.url_for(symbolized)
+          _routes.url_for(options.symbolize_keys.reverse_merge!(url_options))
         when String
           options
         else
diff --git a/actionpack/test/controller/url_for_test.rb b/actionpack/test/controller/url_for_test.rb
index 04a431c5c9..aa233d6135 100644
--- a/actionpack/test/controller/url_for_test.rb
+++ b/actionpack/test/controller/url_for_test.rb
@@ -356,24 +356,6 @@ module AbstractController
         assert_equal("/c/a", W.new.url_for(HashWithIndifferentAccess.new('controller' => 'c', 'action' => 'a', 'only_path' => true)))
       end
 
-      def test_with_stringified_default_url_options
-        W.default_url_options['controller'] = 'd'
-        W.default_url_options['only_path']  = false
-        assert_equal("/c", W.new.url_for(:controller => 'c', :only_path => true))
-
-        W.default_url_options['action'] = 'b'
-        assert_equal("/c/a", W.new.url_for(:controller => 'c', :action => 'a', :only_path => true))
-      end
-
-      def test_with_stringified_default_url_options_and_without_options
-        W.default_url_options['controller'] = 'c'
-        W.default_url_options['only_path']  = true
-        assert_equal("/c", W.new.url_for)
-
-        W.default_url_options['action'] = 'a'
-        assert_equal("/c/a", W.new.url_for)
-      end
-
       def test_url_params_with_nil_to_param_are_not_in_url
         assert_equal("/c/a", W.new.url_for(:only_path => true, :controller => 'c', :action => 'a', :id => Struct.new(:to_param).new(nil)))
       end