diff --git a/htdocs/compta/facture/document.php b/htdocs/compta/facture/document.php
index 1685da08a2e..6e211c62afd 100644
--- a/htdocs/compta/facture/document.php
+++ b/htdocs/compta/facture/document.php
@@ -34,7 +34,7 @@ require_once DOL_DOCUMENT_ROOT.'/core/lib/invoice.lib.php';
 require_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
 require_once DOL_DOCUMENT_ROOT.'/core/lib/images.lib.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/html.formfile.class.php';
-if (!empty($conf->project->enabled)) {
+if (isModEnabled('project')) {
 	include_once DOL_DOCUMENT_ROOT.'/projet/class/project.class.php';
 }
 
@@ -138,7 +138,7 @@ if ($id > 0 || !empty($ref)) {
 		// Thirdparty
 		$morehtmlref .= '<br>'.$langs->trans('ThirdParty').' : '.$object->thirdparty->getNomUrl(1, 'customer');
 		// Project
-		if (!empty($conf->project->enabled)) {
+		if (isModEnabled('project')) {
 			$langs->load("projects");
 			$morehtmlref .= '<br>'.$langs->trans('Project').' ';
 			if ($user->rights->facture->creer) {