diff --git a/ChangeLog b/ChangeLog
index ccb7820d093..1083ec06979 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,7 @@ For users:
 - New: VAT number is stored in one field. This is more "international".
 - Fix: bug #28055 : Unable to modify the date of a cloned command
 - Fix: bug #27891
+- Fix: Change of numbering module was not effective
 
 
 ***** ChangeLog for 2.7 compared to 2.6 *****
diff --git a/htdocs/facture.class.php b/htdocs/facture.class.php
index 1a722fb62be..e48be24fe4f 100644
--- a/htdocs/facture.class.php
+++ b/htdocs/facture.class.php
@@ -2169,10 +2169,10 @@ class Facture extends CommonObject
 		global $conf, $db, $langs;
 		$langs->load("bills");
 
-		if (defined("FACTURE_ADDON") && FACTURE_ADDON)
+		if (! empty($conf->global->FACTURE_ADDON))
 		{
-			$file = FACTURE_ADDON."/".FACTURE_ADDON.".modules.php";
-			$classname = "mod_facture_".FACTURE_ADDON;
+			$file = $conf->global->FACTURE_ADDON."/".$conf->global->FACTURE_ADDON.".modules.php";
+			$classname = "mod_facture_".$conf->global->FACTURE_ADDON;
 
 			// Include file with class
 			$mybool=false;