diff --git a/htdocs/conf/conf.class.php b/htdocs/conf/conf.class.php
index 1176df51316..8760943c15d 100644
--- a/htdocs/conf/conf.class.php
+++ b/htdocs/conf/conf.class.php
@@ -133,7 +133,7 @@ class Conf
 		/*
 		 * Charge l'objet de traduction et positionne langage courant global
 		 */
-		if (! $this->global->MAIN_LANG_DEFAULT) $this->global->MAIN_LANG_DEFAULT="fr_FR";
+		if (empty($this->global->MAIN_LANG_DEFAULT)) $this->global->MAIN_LANG_DEFAULT="fr_FR";
 
 		/*
 		 * Autres parametres globaux de configurations