diff --git a/core/lib/Drupal/Core/Utility/LinkGenerator.php b/core/lib/Drupal/Core/Utility/LinkGenerator.php
index 70af473..e5fbfdb 100644
--- a/core/lib/Drupal/Core/Utility/LinkGenerator.php
+++ b/core/lib/Drupal/Core/Utility/LinkGenerator.php
@@ -149,7 +149,7 @@ public function generate($text, Url $url) {
 
     // Move attributes out of options since generateFromRoute() doesn't need
     // them. Include a placeholder for the href.
-    $attributes = array('href' => '') + $variables['options']['attributes'];
+    $attributes = array_merge(array('href' => ''), $variables['options']['attributes']);
     unset($variables['options']['attributes']);
     $url->setOptions($variables['options']);