core/includes/common.inc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/core/includes/common.inc b/core/includes/common.inc
index cf084a7..6125461 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -1682,13 +1682,13 @@ function drupal_get_js($scope = 'header', $javascript = NULL, $skip_alter = FALS
  *   The merged #attached array.
  */
 function drupal_merge_attached(array $a, array $b) {
-  $result = NestedArray::mergeDeep($a, $b);
   // If both #attached arrays contain drupalSettings, then merge them correctly;
   // adding the same settings multiple times needs to behave idempotently.
   if (!empty($a['drupalSettings']) && !empty($b['drupalSettings'])) {
-    $result['drupalSettings'] = NestedArray::mergeDeepArray([$a['drupalSettings'], $b['drupalSettings']], TRUE);
+    $a['drupalSettings'] = NestedArray::mergeDeepArray([$a['drupalSettings'], $b['drupalSettings']], TRUE);
+    unset($b['drupalSettings']);
   }
-  return $result;
+  return NestedArray::mergeDeep($a, $b);
 }
 
 /**