diff --git a/xml_dsl/__manifest__.py b/xml_dsl/__manifest__.py
index 586f206..82dee1a 100644
--- a/xml_dsl/__manifest__.py
+++ b/xml_dsl/__manifest__.py
@@ -19,7 +19,7 @@
     'name': 'Odoo XML DSL base module and fns',
     'summary': 'Odoo XML Domain Specific Language base module and functions',
     'description': """ Odoo XML Domain Specific Language base module and functions """,
-    'version': '10.0.0.1.0',
+    'version': '12.0.0.1.0',
     'category': 'Yaltik',
     'author': 'Fabien Bourgeois',
     'license': 'AGPL-3',
diff --git a/xml_dsl/odoo.py b/xml_dsl/odoo.py
index b4a3be7..5a866ab 100644
--- a/xml_dsl/odoo.py
+++ b/xml_dsl/odoo.py
@@ -74,7 +74,7 @@ def xml_write(mpath, filename, tree):
     """ Write XML file according to filename and given tree """
     import os.path
     from xml.etree import ElementTree as ET
-    output_xml = ET.tostring(tree)
+    output_xml = ET.tostring(tree).decode('utf-8')
     output_path = os.path.dirname(os.path.abspath(mpath))
     fpath = u'%s/%s' % (output_path, filename)
     with open(fpath, 'w') as xml_file: