diff --git a/htdocs/core/modules/facture/mod_facture_mercure.php b/htdocs/core/modules/facture/mod_facture_mercure.php
index 15a3d371915..88217172c76 100644
--- a/htdocs/core/modules/facture/mod_facture_mercure.php
+++ b/htdocs/core/modules/facture/mod_facture_mercure.php
@@ -167,7 +167,7 @@ class mod_facture_mercure extends ModeleNumRefFactures
     	// Get entities
     	$entity = getEntity('invoicenumber', 1, $invoice);
 
-    	$numFinal=get_next_value($db,$mask,'facture','facnumber',$where,$objsoc,$facture->date,$mode,false,null,$entity);
+    	$numFinal=get_next_value($db,$mask,'facture','facnumber',$where,$objsoc,$invoice->date,$mode,false,null,$entity);
     	if (! preg_match('/([0-9])+/',$numFinal)) $this->error = $numFinal;
 
     	return  $numFinal;