diff --git a/lib/routing/sfRouting.class.php b/lib/routing/sfRouting.class.php
index 5c13c0206..7b0c245e4 100644
--- a/lib/routing/sfRouting.class.php
+++ b/lib/routing/sfRouting.class.php
@@ -68,7 +68,7 @@ public function initialize(sfEventDispatcher $dispatcher, ?sfCache $cache = null
     {
         $this->dispatcher = $dispatcher;
 
-        $options['debug'] = isset($options['debug']) ? (bool) $options['debug'] : false;
+        $options['debug'] = (bool) $options['debug'] ?? false;
 
         // disable caching when in debug mode
         $this->cache = $options['debug'] ? null : $cache;