diff --git a/addons/stock_landed_costs/stock_landed_costs.py b/addons/stock_landed_costs/stock_landed_costs.py
index e6ccde996b2..1dad39ef1e9 100644
--- a/addons/stock_landed_costs/stock_landed_costs.py
+++ b/addons/stock_landed_costs/stock_landed_costs.py
@@ -65,12 +65,11 @@ class stock_landed_cost(osv.osv):
                 if move.product_id.valuation != 'real_time' or move.product_id.cost_method != 'real':
                     continue
                 total_cost = 0.0
-                total_qty = move.product_qty
                 weight = move.product_id and move.product_id.weight * move.product_qty
                 volume = move.product_id and move.product_id.volume * move.product_qty
                 for quant in move.quant_ids:
-                    total_cost += quant.cost
-                vals = dict(product_id=move.product_id.id, move_id=move.id, quantity=move.product_uom_qty, former_cost=total_cost * total_qty, weight=weight, volume=volume)
+                    total_cost += quant.cost * quant.qty
+                vals = dict(product_id=move.product_id.id, move_id=move.id, quantity=move.product_uom_qty, former_cost=total_cost, weight=weight, volume=volume)
                 lines.append(vals)
         if not lines:
             raise osv.except_osv(_('Error!'), _('The selected picking does not contain any move that would be impacted by landed costs. Landed costs are only possible for products configured in real time valuation with real price costing method. Please make sure it is the case, or you selected the correct picking'))