diff --git a/htdocs/projet/class/task.class.php b/htdocs/projet/class/task.class.php
index 6136198fd5e..f3f75b716c1 100644
--- a/htdocs/projet/class/task.class.php
+++ b/htdocs/projet/class/task.class.php
@@ -26,6 +26,7 @@
  */
 
 require_once DOL_DOCUMENT_ROOT.'/core/class/commonobject.class.php';
+require_once DOL_DOCUMENT_ROOT.'/projet/class/project.class.php';
 
 
 /**