diff --git a/htdocs/core/class/conf.class.php b/htdocs/core/class/conf.class.php
index 62c7f0f9e24..e3b6ac4e524 100644
--- a/htdocs/core/class/conf.class.php
+++ b/htdocs/core/class/conf.class.php
@@ -490,7 +490,10 @@ class Conf
         if (empty($this->global->ACCOUNTING_MODE)) $this->global->ACCOUNTING_MODE='RECETTES-DEPENSES';  // By default. Can be 'RECETTES-DEPENSES' ou 'CREANCES-DETTES'
 
         // By default, suppliers objects can be linked to all projects
-        $this->global->PROJECT_CAN_ALWAYS_LINK_TO_ALL_SUPPLIERS = 1;
+        if (! isset($this->global->PROJECT_CAN_ALWAYS_LINK_TO_ALL_SUPPLIERS)) $this->global->PROJECT_CAN_ALWAYS_LINK_TO_ALL_SUPPLIERS = 1;
+
+        // By default we enable feature to bill time spent
+        if (! isset($this->global->PROJECT_BILL_TIME_SPENT)) $this->global->PROJECT_BILL_TIME_SPENT = 1;
 
         // MAIN_HTML_TITLE
         if (! isset($this->global->MAIN_HTML_TITLE)) $this->global->MAIN_HTML_TITLE='noapp,thirdpartynameonly,contactnameonly,projectnameonly';