diff --git a/htdocs/projet/tasks.php b/htdocs/projet/tasks.php
index 5a33f8ca4f2..b125ed7306e 100644
--- a/htdocs/projet/tasks.php
+++ b/htdocs/projet/tasks.php
@@ -31,6 +31,7 @@ require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/html.formother.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/extrafields.class.php';
 require_once DOL_DOCUMENT_ROOT.'/contact/class/contact.class.php';
+if ($conf->categorie->enabled) { require_once DOL_DOCUMENT_ROOT.'/categories/class/categorie.class.php'; }
 
 // Load translation files required by the page
 $langs->loadLangs(array('projects', 'users', 'companies'));