diff --git a/htdocs/projet/pre.inc.php b/htdocs/projet/pre.inc.php
index 0c7cd157aea..fad60f27f94 100644
--- a/htdocs/projet/pre.inc.php
+++ b/htdocs/projet/pre.inc.php
@@ -29,7 +29,7 @@
 */
 
 require ("../main.inc.php");
-require("./project.class.php");
+require(DOL_DOCUMENT_ROOT."/project.class.php");
 
 $langs->load("projects");
 $langs->load("companies");