diff --git a/php/model/LocalArticleManager.php b/php/model/LocalArticleManager.php
index 95b4a1b..f6ae2fd 100644
--- a/php/model/LocalArticleManager.php
+++ b/php/model/LocalArticleManager.php
@@ -100,7 +100,7 @@ class LocalArticleManager implements ArticleManagerDAO {
         return null;
     }
 
-    public function getAllArticles()
+    public function getAllArticles(): array
     {
         if (!file_exists($this->file)) {
             return [];