diff --git a/src/Metable.php b/src/Metable.php
index 7dc2408..23a028c 100644
--- a/src/Metable.php
+++ b/src/Metable.php
@@ -792,7 +792,7 @@ protected function getMetaInstance(): Meta
      * @return Meta
      */
     protected function makeMeta(
-        string $key = null,
+        null|string $key = null,
         mixed $value = null,
         bool $encrypt = false
     ): Meta {