diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index b644ccb..79ffdd7 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -3111,22 +3111,6 @@ function template_preprocess_region(&$variables) {
 }
 
 /**
- * Prepares variables for dropbutton wrapper templates.
- *
- * Default template: dropbutton-wrapper.html.twig.
- *
- * @param array $variables
- *   An associative array containing:
- *   - element: An associative array containing the properties and children of
- *     the dropbutton menu. Properties used: #children.
- */
-function template_preprocess_dropbutton_wrapper(&$variables) {
-  if (!empty($variables['element']['#children'])) {
-    $variables['children'] = $variables['element']['#children'];
-  }
-}
-
-/**
  * Provides theme registration for themes across .inc files.
  */
 function drupal_common_theme() {
@@ -3158,7 +3142,7 @@ function drupal_common_theme() {
       'variables' => array('links' => array(), 'attributes' => array('class' => array('links')), 'heading' => array()),
     ),
     'dropbutton_wrapper' => array(
-      'render element' => 'element',
+      'variables' => array('children' => NULL),
       'template' => 'dropbutton-wrapper',
     ),
     'image' => array(