diff --git a/module/product/test/product.class.php b/module/product/test/product.class.php
index f00a2af44b..2b6fe5ba26 100644
--- a/module/product/test/product.class.php
+++ b/module/product/test/product.class.php
@@ -1,6 +1,11 @@
 <?php
 class productTest
 {
+    /**
+     * @var productModel
+     * @access private
+     */
+    private productModel $objectModel;
 
     /**
      * __construct