diff --git a/addons/product_visible_discount/product_visible_discount.py b/addons/product_visible_discount/product_visible_discount.py
index bf4c2dc24f0..b347321bebe 100644
--- a/addons/product_visible_discount/product_visible_discount.py
+++ b/addons/product_visible_discount/product_visible_discount.py
@@ -145,7 +145,7 @@ class account_invoice_line(osv.osv):
                     pricelist =partner_obj.browse(cr, uid, partner_id).property_product_pricelist_purchase.id
                     if not pricelist:
                         raise osv.except_osv(_('No Purchase Pricelist Found !'),_("You must first define a pricelist for Supplier !"))
-                    price_unit_res = pricelist_obj.price_get(cr, uid, [pricelist], product.id, qty or 1.0, partner_id, {'uom': uom})[pricelist]
+                    price_unit_res = pricelist_obj.price_get(cr, uid, [pricelist], product.id, qty or 1.0, partner_id, {'uom': uom})
                     price_unit = price_unit_res[pricelist]
                     real_price = get_real_price(price_unit_res, product.id, qty, uom, pricelist)
             else: