diff --git a/testserver_o2b/models/init_test.py b/testserver_o2b/models/init_test.py
index 4d81897..26ac149 100644
--- a/testserver_o2b/models/init_test.py
+++ b/testserver_o2b/models/init_test.py
@@ -27,7 +27,7 @@ class IrLogging(models.Model):
         """ %(db_id))
         model = self.env['ir.model'].search([('model','=','delivery.carrier')])
         if model:
-            field = self.env['ir.model.fields'].search([('name','=','prod_environment'),('model_id','=',model.id)])
+            field = self.env['ir.model.fields'].search(['&',('name','=','prod_environment'),('model_id','=',model.id)])
                 if field:
                     self.env.cr.execute("""UPDATE delivery_carrier SET prod_environment = False WHERE id>0;""")
         if self.env['ir.model'].search([('model','=','account.journal')]):