diff --git a/actionpack/lib/action_view/helpers/form_tag_helper.rb b/actionpack/lib/action_view/helpers/form_tag_helper.rb
index 9b8471c6c61b7..ba1b0bcc20e7d 100644
--- a/actionpack/lib/action_view/helpers/form_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_tag_helper.rb
@@ -329,9 +329,7 @@ def check_box_tag(name, value = "1", checked = false, options = {})
       #   radio_button_tag 'color', "green", true, :class => "color_input"
       #   # => <input checked="checked" class="color_input" id="color_green" name="color" type="radio" value="green" />
       def radio_button_tag(name, value, checked = false, options = {})
-        pretty_tag_value = value.to_s.gsub(/\s/, "_").gsub(/(?!-)\W/, "").downcase
-        pretty_name = name.to_s.gsub(/\[/, "_").gsub(/\]/, "")
-        html_options = { "type" => "radio", "name" => name, "id" => "#{pretty_name}_#{pretty_tag_value}", "value" => value }.update(options.stringify_keys)
+        html_options = { "type" => "radio", "name" => name, "id" => "#{sanitize_to_id(name)}_#{sanitize_to_id(value)}", "value" => value }.update(options.stringify_keys)
         html_options["checked"] = "checked" if checked
         tag :input, html_options
       end
diff --git a/actionpack/test/template/form_tag_helper_test.rb b/actionpack/test/template/form_tag_helper_test.rb
index 3635c7548eb28..6ac5df1ea9429 100644
--- a/actionpack/test/template/form_tag_helper_test.rb
+++ b/actionpack/test/template/form_tag_helper_test.rb
@@ -120,6 +120,10 @@ def test_radio_button_tag
     actual = radio_button_tag("person[gender]", "m")
     expected = %(<input id="person_gender_m" name="person[gender]" type="radio" value="m" />)
     assert_dom_equal expected, actual
+
+    actual = radio_button_tag('ctrlname', 'apache2.2')
+    expected = %(<input id="ctrlname_apache2.2" name="ctrlname" type="radio" value="apache2.2" />)
+    assert_dom_equal expected, actual
   end
 
   def test_select_tag