diff --git a/htdocs/core/modules/supplier_invoice/mod_facture_fournisseur_tulip.php b/htdocs/core/modules/supplier_invoice/mod_facture_fournisseur_tulip.php
index fc47fbdae3b..c670b5c68df 100644
--- a/htdocs/core/modules/supplier_invoice/mod_facture_fournisseur_tulip.php
+++ b/htdocs/core/modules/supplier_invoice/mod_facture_fournisseur_tulip.php
@@ -124,7 +124,7 @@ class mod_facture_fournisseur_tulip extends ModeleNumRefSuppliersInvoices
 			return 0;
 		}
 
-		$numFinal=get_next_value($db,$mask,'facture_fourn','ref','',$objsoc->code_fournisseur,$object->datec);
+		$numFinal=get_next_value($db,$mask,'facture_fourn','ref','',$objsoc->code_fournisseur,$object->datef);
 
 		return  $numFinal;
 	}