diff --git a/htdocs/modulebuilder/template/class/myobject.class.php b/htdocs/modulebuilder/template/class/myobject.class.php
index 3acc7c649f4..52335984ac8 100644
--- a/htdocs/modulebuilder/template/class/myobject.class.php
+++ b/htdocs/modulebuilder/template/class/myobject.class.php
@@ -24,6 +24,7 @@
 
 // Put here all includes required by your class file
 require_once DOL_DOCUMENT_ROOT . '/core/class/commonobject.class.php';
+require_once DOL_DOCUMENT_ROOT . '/core/lib/files.lib.php';
 //require_once DOL_DOCUMENT_ROOT . '/societe/class/societe.class.php';
 //require_once DOL_DOCUMENT_ROOT . '/product/class/product.class.php';