diff --git a/Admin/Installer.php b/Admin/Installer.php
index 03d9bfe..448301b 100644
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -59,7 +59,7 @@ final class Installer extends InstallerAbstract
     {
         $itemAttrType = [];
 
-        $itemAttrType['color'] = new ItemAttributeType('color');
+        $itemAttrType['color'] = new ItemAttributeType('color'); // @todo: I think 'color' in this case is a ItemAttributeTypeL11n, this is wrong?!
         ItemAttributeTypeMapper::create($itemAttrType['color']);
         ItemAttributeTypeL11nMapper::create(new ItemAttributeTypeL11n($itemAttrType['color']->getId(), 'Color', ISO639x1Enum::_EN));
         ItemAttributeTypeL11nMapper::create(new ItemAttributeTypeL11n($itemAttrType['color']->getId(), 'Farbe', ISO639x1Enum::_DE));
diff --git a/Models/ItemAttributeTypeL11n.php b/Models/ItemAttributeTypeL11n.php
index 6fe69ba..b716474 100644
--- a/Models/ItemAttributeTypeL11n.php
+++ b/Models/ItemAttributeTypeL11n.php
@@ -41,7 +41,7 @@ class ItemAttributeTypeL11n implements \JsonSerializable, ArrayableInterface
      * @var int|ItemL11nType
      * @since 1.0.0
      */
-    protected $type = 0;
+    protected int|ItemL11nType $type = 0;
 
     /**
      * Language.
@@ -68,7 +68,7 @@ class ItemAttributeTypeL11n implements \JsonSerializable, ArrayableInterface
      *
      * @since 1.0.0
      */
-    public function __construct($type = 0, string $title = '', string $language = ISO639x1Enum::_EN)
+    public function __construct(int|ItemL11nType $type = 0, string $title = '', string $language = ISO639x1Enum::_EN)
     {
         $this->type     = $type;
         $this->title    = $title;