diff --git a/core/event.php b/core/event.php
index f1cc3130..c615af10 100644
--- a/core/event.php
+++ b/core/event.php
@@ -51,7 +51,7 @@ class PageRequestEvent extends Event
     /**
      * @var string[]
      */
-    public $args;
+    public array $args;
     public int $arg_count;
     public int $part_count;