diff --git a/core/lib/Drupal/Core/Routing/RouteProvider.php b/core/lib/Drupal/Core/Routing/RouteProvider.php
index 5695617..13fc0eb 100644
--- a/core/lib/Drupal/Core/Routing/RouteProvider.php
+++ b/core/lib/Drupal/Core/Routing/RouteProvider.php
@@ -343,14 +343,14 @@ protected function getRoutesByPath($path) {
       ->fetchAll(\PDO::FETCH_ASSOC);
 
     // We sort by fit and name in PHP to avoid a SQL filesort.
-    usort($routes, array($this, function(array $a, array $b) {
+    usort($routes, function(array $a, array $b) {
       if ($a['fit'] == $b['fit']) {
         return strcmp($a['name'], $b['name']);
       }
       // Reverse sort from highest to lowest fit. PHP should cast to int, but
       // the explicit cast makes this sort more robust against unexpected input.
       return (int) $a['fit'] < (int) $b['fit'] ? 1 : -1;
-    }));
+    });
 
     foreach ($routes as $row) {
       $collection->add($row['name'], unserialize($row['route']));