diff --git a/addons/purchase/test/fifo_price.yml b/addons/purchase/test/fifo_price.yml
index 63b42706191..1b8984c7f89 100644
--- a/addons/purchase/test/fifo_price.yml
+++ b/addons/purchase/test/fifo_price.yml
@@ -297,6 +297,11 @@
   !python {model: stock.picking}: |
     picking_obj = self.browse(cr, uid, ref("outgoing_fifo_shipment_neg"))
     picking_obj.do_partial(context=context)
+-
+  The behavior of fifo/lifo is not garantee if the quants are created at the same second, so i just wait one second
+-
+    import time
+    time.sleep(1)
 -
   Let us create another out of 400 kg
 - 
@@ -392,4 +397,4 @@
     quant_obj = self.pool.get("stock.quant")
     quants = quant_obj.search(cr, uid, [('product_id','=',ref("product_fifo_negative"))])
     print "Quants:", [(x.qty, x.location_id.name, x.in_date, x.cost, x.id) for x in quant_obj.browse(cr, uid, quants)]
-    assert self.browse(cr, uid, ref("product_fifo_negative")).standard_price == 65.0, "Product price not updated accordingly. %s found instead of 65" %(self.browse(cr, uid, ref("product_fifo_negative")).standard_price,)
\ No newline at end of file
+    assert self.browse(cr, uid, ref("product_fifo_negative")).standard_price == 65.0, "Product price not updated accordingly. %s found instead of 65" %(self.browse(cr, uid, ref("product_fifo_negative")).standard_price,)