diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index e593068826b..6d71c35a4df 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -365,7 +365,6 @@ if (! empty($_SESSION["disablemodules"]))
 	}
 }
 
-
 /*
  * Phase authentication / login
  */
diff --git a/htdocs/master.inc.php b/htdocs/master.inc.php
index ce3080e32e4..52c4c9780c7 100644
--- a/htdocs/master.inc.php
+++ b/htdocs/master.inc.php
@@ -235,7 +235,8 @@ if (! defined('NOREQUIREDB') && ! defined('NOREQUIRESOC'))
 if (! defined('NOREQUIRETRAN'))
 {
     $langcode=(GETPOST('lang','aZ09')?GETPOST('lang','aZ09',1):(empty($conf->global->MAIN_LANG_DEFAULT)?'auto':$conf->global->MAIN_LANG_DEFAULT));
-	$langs->setDefaultLang($langcode);
+    if (defined('MAIN_LANG_DEFAULT')) $langcode=constant('MAIN_LANG_DEFAULT');
+    $langs->setDefaultLang($langcode);
 }