diff --git a/stock.py b/stock.py
index 61178dc3f0..32002329cd 100644
--- a/stock.py
+++ b/stock.py
@@ -1,6 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from sql import Null
+from sql.conditionals import Case
 
 from trytond.model import fields
 from trytond.pyson import Not, Eval, Bool
@@ -40,4 +41,4 @@ class Location:
     @staticmethod
     def order_sequence(tables):
         table, _ = tables[None]
-        return [table.sequence == Null, table.sequence]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]