diff --git a/system/core/Router.php b/system/core/Router.php
index e0fb922f1a..2591e4aa31 100644
--- a/system/core/Router.php
+++ b/system/core/Router.php
@@ -49,6 +49,7 @@
  * @author		EllisLab Dev Team
  * @link		https://codeigniter.com/userguide3/general/routing.html
  */
+#[\AllowDynamicProperties]
 class CI_Router {
 
 	/**