diff --git a/htdocs/commande/orderstoinvoice.php b/htdocs/commande/orderstoinvoice.php
index 5ea4e5b72cbee..7411d3a93689f 100644
--- a/htdocs/commande/orderstoinvoice.php
+++ b/htdocs/commande/orderstoinvoice.php
@@ -285,7 +285,7 @@
 												'HT',
 												0,
 												$product_type,
-												$lines[$i]->rang,
+												$ii,
 												$lines[$i]->special_code,
 												$object->origin,
 												$lines[$i]->rowid,