diff --git a/addons/point_of_sale/pos.py b/addons/point_of_sale/pos.py
index 8b8c320152e..ce92ee977b2 100644
--- a/addons/point_of_sale/pos.py
+++ b/addons/point_of_sale/pos.py
@@ -343,8 +343,8 @@ class pos_order(osv.osv):
                         'product_uos': line.product_id.uom_id.id,
                         'picking_id': picking_id,
                         'product_id': line.product_id.id,
-                        'product_uos_qty': line.qty,
-                        'product_qty': line.qty,
+                        'product_uos_qty': abs(line.qty),
+                        'product_qty': abs(line.qty),
                         'tracking_id': False,
                         'state': 'waiting',
                         'location_id': location_id,