diff --git a/rma_purchase/models/rma_operation.py b/rma_purchase/models/rma_operation.py
index 3892bad3..51ed3cdd 100644
--- a/rma_purchase/models/rma_operation.py
+++ b/rma_purchase/models/rma_operation.py
@@ -1,8 +1,9 @@
+# -*- coding: utf-8 -*-
 # Copyright 2018 Eficent Business and IT Consulting Services S.L.
 # License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl.html)
 
-from odoo import api, models, _
-from odoo.exceptions import ValidationError
+from openerp import api, fields, models, _
+from openerp.exceptions import ValidationError
 
 
 class RmaOperation(models.Model):
diff --git a/rma_purchase/views/rma_operation_view.xml b/rma_purchase/views/rma_operation_view.xml
index 1afff91d..9f4b5a86 100644
--- a/rma_purchase/views/rma_operation_view.xml
+++ b/rma_purchase/views/rma_operation_view.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2018 Eficent Business and IT Consulting Services S.L.
      License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl-3.0) -->
 <odoo>