diff --git a/pynfe/entidades/servico.py b/pynfe/entidades/servico.py
index 7621f52..c8d7de9 100644
--- a/pynfe/entidades/servico.py
+++ b/pynfe/entidades/servico.py
@@ -1,7 +1,11 @@
+# -*- coding: utf-8 -*-
+
 """
     @author: Junior Tada, Leonardo Tada
 """
 
+from __future__ import division, print_function, unicode_literals
+
 from .base import Entidade
 from decimal import Decimal