diff --git a/addons/sale/sale.py b/addons/sale/sale.py
index bbdb28a29fd..28d95384350 100644
--- a/addons/sale/sale.py
+++ b/addons/sale/sale.py
@@ -85,7 +85,7 @@ class sale_order(osv.osv):
 			val = 0.0
 			cur=order.pricelist_id.currency_id
 			for line in order.order_line:
-				for c in self.pool.get('account.tax').compute(cr, uid, line.tax_id, line.price_unit * (1-(line.discount or 0.0)/100.0), line.product_uom_qty, order.partner_invoice_id.id, line.product_id, order.partner_id):
+				for c in self.pool.get('account.tax').compute(cr, uid, line.tax_id, line.price_unit * (1-(line.discount or 0.0)/100.0), line.product_uos_qty, order.partner_invoice_id.id, line.product_id, order.partner_id):
 					val+= cur_obj.round(cr, uid, cur, c['amount'])
 			res[order.id]=cur_obj.round(cr, uid, cur, val)
 		return res