diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 061fb804ab0..c28a979369a 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -817,7 +817,7 @@ class ProcurementOrder(models.Model):
     @api.v8
     def _get_purchase_order_date(self, schedule_date):
         self.ensure_one()
-        seller_delay = int(self.product_id._select_seller(self.product_id).delay)
+        seller_delay = int(self.product_id._select_seller(product_id=self.product_id, quantity=self.product_qty).delay)
         return schedule_date - relativedelta(days=seller_delay)
 
     @api.v7