diff --git a/admin/class-admin.php b/admin/class-admin.php
index 27d0b04d..15831145 100644
--- a/admin/class-admin.php
+++ b/admin/class-admin.php
@@ -27,9 +27,9 @@ class Admin {
 	/**
 	 * Class constructor for injecting dependencies.
 	 *
-	 * @param Meta_Boxes|null $meta_boxes Meta boxes instance.
+	 * @param Meta_Boxes $meta_boxes Meta boxes instance.
 	 */
-	public function __construct( Meta_Boxes $meta_boxes = null ) {
+	public function __construct( Meta_Boxes $meta_boxes ) {
 		$this->meta_boxes = $meta_boxes;
 	}