diff --git a/htdocs/projet/element.php b/htdocs/projet/element.php
index dd89b3ca9c4..10137156233 100644
--- a/htdocs/projet/element.php
+++ b/htdocs/projet/element.php
@@ -54,6 +54,7 @@ if (! empty($conf->stock->enabled))			require_once DOL_DOCUMENT_ROOT.'/product/s
 if (! empty($conf->tax->enabled))			require_once DOL_DOCUMENT_ROOT.'/compta/sociales/class/chargesociales.class.php';
 if (! empty($conf->banque->enabled))		require_once DOL_DOCUMENT_ROOT.'/compta/bank/class/paymentvarious.class.php';
 if (! empty($conf->salaries->enabled))		require_once DOL_DOCUMENT_ROOT.'/salaries/class/paymentsalary.class.php';
+if (! empty($conf->categorie->enabled))		require_once DOL_DOCUMENT_ROOT.'/categories/class/categorie.class.php';
 
 // Load translation files required by the page
 $langs->loadLangs(array('projects', 'companies', 'suppliers', 'compta'));