diff --git a/php/controller/showCategory-controller.php b/php/controller/showCategory-controller.php
index 47796a5..a9f7cb5 100644
--- a/php/controller/showCategory-controller.php
+++ b/php/controller/showCategory-controller.php
@@ -1,6 +1,7 @@
 <?php
 require_once '../model/LocalArticleManager.php';
 require_once '../model/ArticleManager.php';
+require_once '../validator/article-validator.php';
 
 if (isset($_GET["category"]) && !empty($_GET["category"]) && articleCategoryValidator($_GET["category"])){
     $category = $_GET["category"];