diff --git a/htdocs/categories/class/categorie.class.php b/htdocs/categories/class/categorie.class.php
index 6c43e818ecc..28320ecf41a 100644
--- a/htdocs/categories/class/categorie.class.php
+++ b/htdocs/categories/class/categorie.class.php
@@ -37,6 +37,7 @@ require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
 require_once DOL_DOCUMENT_ROOT.'/ticket/class/ticket.class.php';
 require_once DOL_DOCUMENT_ROOT.'/fourn/class/fournisseur.class.php';
 require_once DOL_DOCUMENT_ROOT.'/contact/class/contact.class.php';
+require_once DOL_DOCUMENT_ROOT.'/knowledgemanagement/class/knowledgerecord.class.php';
 
 
 /**