diff --git a/core/modules/system/lib/Drupal/system/Controller/SystemController.php b/core/modules/system/lib/Drupal/system/Controller/SystemController.php
index d2261d9..5c62574 100644
--- a/core/modules/system/lib/Drupal/system/Controller/SystemController.php
+++ b/core/modules/system/lib/Drupal/system/Controller/SystemController.php
@@ -298,14 +298,14 @@ public function themesPage() {
     }
 
     uasort($theme_groups['enabled'], function($a, $b) {
-        if ($a->is_default) {
-          return -1;
-        }
-        if ($b->is_default) {
-          return 1;
-        }
-        return strcasecmp($a->info['name'], $b->info['name']);
-      });
+      if ($a->is_default) {
+        return -1;
+      }
+      if ($b->is_default) {
+        return 1;
+      }
+      return strcasecmp($a->info['name'], $b->info['name']);
+    });
     $this->moduleHandler()->alter('system_themes_page', $theme_groups);
 
     $build = array();
@@ -327,16 +327,4 @@ public function themeSetDefault() {
     return system_theme_default();
   }
 
-  /**
-   * Array sorting callback; sorts themes by their name.
-   */
-  protected static function systemSortThemes($a, $b) {
-    if ($a->is_default) {
-      return -1;
-    }
-    if ($b->is_default) {
-      return 1;
-    }
-    return strcasecmp($a->info['name'], $b->info['name']);
-  }
 }