diff --git a/htdocs/core/modules/facture/mod_facture_mercure.php b/htdocs/core/modules/facture/mod_facture_mercure.php
index 890d56e874b..65594470c30 100644
--- a/htdocs/core/modules/facture/mod_facture_mercure.php
+++ b/htdocs/core/modules/facture/mod_facture_mercure.php
@@ -90,7 +90,7 @@ class mod_facture_mercure extends ModeleNumRefFactures
 
 		// Prefix setting of credit note
 		$texte .= '<tr><td><span class="opacitymedium">'.$langs->trans("Mask").' ('.$langs->trans("InvoiceAvoir").'):</span></td>';
-		$texte .= '<td class="right">'.$form->textwithpicto('<input type="text" class="flat minwidth175" name="maskcredit" value="'.$conf->global->FACTURE_MERCURE_MASK_CREDIT.'">', $tooltip, 1, 1).'</td>';
+		$texte .= '<td class="right">'.$form->textwithpicto('<input type="text" class="flat minwidth175" name="maskcredit" value="FACTURE_MERCURE_MASK_CREDIT">', $tooltip, 1, 1).'</td>';
 		$texte .= '</tr>';
 
 		// Prefix setting of deposit