diff --git a/core/modules/search/src/SearchIndex.php b/core/modules/search/src/SearchIndex.php
index 4d67d63753..5a3244484a 100644
--- a/core/modules/search/src/SearchIndex.php
+++ b/core/modules/search/src/SearchIndex.php
@@ -118,7 +118,7 @@ public function index($type, $sid, $langcode, $text, $update_weights = TRUE) {
     foreach ($split as $value) {
       if ($tag) {
         // Increase or decrease score per word based on tag.
-        [$tagname] = explode(' ', $value, 2);
+        list($tagname) = explode(' ', $value, 2);
         $tagname = mb_strtolower($tagname);
         // Closing or opening tag?
         if ($tagname[0] == '/') {