diff --git a/src/Handlers/DatabaseHandler.php b/src/Handlers/DatabaseHandler.php
index 70322f3..d93b34c 100644
--- a/src/Handlers/DatabaseHandler.php
+++ b/src/Handlers/DatabaseHandler.php
@@ -29,7 +29,7 @@ class DatabaseHandler extends ArrayHandler
      *
      * @var list<null>|list<string>
      */
-    private $hydrated = [];
+    private array $hydrated = [];
 
     private Settings $config;