diff --git a/core/modules/config_translation/lib/Drupal/config_translation/Controller/ConfigTranslationMapperList.php b/core/modules/config_translation/lib/Drupal/config_translation/Controller/ConfigTranslationMapperList.php
index 1e8e822..9f82da0 100644
--- a/core/modules/config_translation/lib/Drupal/config_translation/Controller/ConfigTranslationMapperList.php
+++ b/core/modules/config_translation/lib/Drupal/config_translation/Controller/ConfigTranslationMapperList.php
@@ -70,11 +70,11 @@ public function render() {
     // Group by mapper weight and sort by label.
     ksort($mappers);
     foreach ($mappers as $weight => $mapper) {
-      usort($mapper, array($this, function ($a, $b) {
+      usort($mapper, function ($a, $b) {
         $a_title = (isset($a['label'])) ? $a['label'] : '';
         $b_title = (isset($b['label'])) ? $b['label'] : '';
         return strnatcasecmp($a_title, $b_title);
-      }));
+      });
       $mappers[$weight] = $mapper;
     }