diff --git a/core/includes/common.inc b/core/includes/common.inc
index b392cd9..6dd1818 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -4331,8 +4331,8 @@ function element_info_property($type, $property_name, $default = NULL) {
  *
  * @deprecated as of Drupal 8.0. Use SortArray::sortByWeightElement() instead.
  */
-function drupal_sort_weight(array $a, array $b) {
-  return SortArray::sortByWeightElement($a, $b);
+function drupal_sort_weight($a, $b) {
+  return SortArray::sortByWeightElement((array) $a, (array) $b);
 }
 
 /**