diff --git a/addons/sale_stock/models/sale_order.py b/addons/sale_stock/models/sale_order.py
index f4c59a48f10..597e8aed1f6 100644
--- a/addons/sale_stock/models/sale_order.py
+++ b/addons/sale_stock/models/sale_order.py
@@ -199,7 +199,7 @@ class SaleOrderLine(models.Model):
             return {
                 'warning': {
                     'title': _('Warning'),
-                    'message': _("This product is packaged by %d . You should sell %d .") % (pack.qty, newqty),
+                    'message': _("This product is packaged by %.2f %s. You should sell %.2f %s.") % (pack.qty, default_uom.name, newqty, self.product_uom.name),
                 },
             }
         return {}