diff --git a/core/includes/form.inc b/core/includes/form.inc
index 5d4a943..b5c6de3 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -1047,30 +1047,34 @@ function form_pre_render_radio($element) {
 }
 
 /**
- * Returns HTML for a set of radio button form elements.
+ * Prepares variables for radios templates.
  *
- * @param $variables
+ * Default template: radios.html.twig.
+ *
+ * @param array $variables
  *   An associative array containing:
  *   - element: An associative array containing the properties of the element.
  *     Properties used: #title, #value, #options, #description, #required,
  *     #attributes, #children.
  *
- * @ingroup themeable
  */
-function theme_radios($variables) {
+function template_preprocess_radios(&$variables) {
   $element = $variables['element'];
-  $attributes = array();
   if (isset($element['#id'])) {
-    $attributes['id'] = $element['#id'];
+    $variables['attributes']['id'] = $element['#id'];
   }
-  $attributes['class'] = 'form-radios';
+  $variables['attributes']['class'] = array();
+  $variables['attributes']['class'][] = 'form-radios';
   if (!empty($element['#attributes']['class'])) {
-    $attributes['class'] .= ' ' . implode(' ', $element['#attributes']['class']);
+    $variables['attributes']['class'] = array_merge($variables['attributes']['class'], $element['#attributes']['class']);
   }
   if (isset($element['#attributes']['title'])) {
-    $attributes['title'] = $element['#attributes']['title'];
+    $variables['attributes']['title'] = $element['#attributes']['title'];
   }
-  return '<div' . new Attribute($attributes) . '>' . (!empty($element['#children']) ? $element['#children'] : '') . '</div>';
+  $variables['children'] = isset($element['#children']) ? $element['#children'] : '';
+
+  // Remove the disabled attibute on the wrapper.
+  unset($variables['attributes']['disabled']);
 }
 
 /**
diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 144882b..1514073 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2713,6 +2713,7 @@ function drupal_common_theme() {
     ),
     'radios' => array(
       'render element' => 'element',
+      'template' => 'radios',
     ),
     'date' => array(
       'render element' => 'element',