diff --git a/core/lib/Drupal/Core/Routing/RouteBuilder.php b/core/lib/Drupal/Core/Routing/RouteBuilder.php
index ea2c661..9ffb7bd 100644
--- a/core/lib/Drupal/Core/Routing/RouteBuilder.php
+++ b/core/lib/Drupal/Core/Routing/RouteBuilder.php
@@ -139,6 +139,10 @@ protected function checkRebuildNeeded() {
    * {@inheritdoc}
    */
   public function rebuild() {
+    if (!$this->checkRebuildNeeded()) {
+      return FALSE;
+    }
+
     if ($this->building) {
       throw new \RuntimeException('Recursive router rebuild detected.');
     }