diff --git a/odoo/osv/expression.py b/odoo/osv/expression.py
index e96e550918b..5bf4c606a34 100644
--- a/odoo/osv/expression.py
+++ b/odoo/osv/expression.py
@@ -555,7 +555,7 @@ class expression(object):
             if left_model._parent_store:
                 domain = OR([
                     [('parent_path', '=like', rec.parent_path + '%')]
-                    for rec in left_model.browse(ids)
+                    for rec in left_model.sudo().browse(ids)
                 ])
             else:
                 # recursively retrieve all children nodes with sudo(); the
@@ -581,7 +581,7 @@ class expression(object):
             if left_model._parent_store:
                 parent_ids = [
                     int(label)
-                    for rec in left_model.browse(ids)
+                    for rec in left_model.sudo().browse(ids)
                     for label in rec.parent_path.split('/')[:-1]
                 ]
                 domain = [('id', 'in', parent_ids)]