diff --git a/moipy/moip.py b/moipy/moip.py
index 4692846..27f1878 100644
--- a/moipy/moip.py
+++ b/moipy/moip.py
@@ -1,5 +1,6 @@
 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
+
 import base64
 import pycurl
 
@@ -89,12 +90,11 @@ def envia(self):
         resposta = RespostaMoIP()
         
         passwd = self.token + ":" + self.key
-
-        passwd64 = base64.b64encode(passwd)
+        passwd64 = base64.b64encode(passwd.encode())
         
         curl = pycurl.Curl()
         curl.setopt(pycurl.URL,self.url)
-        curl.setopt(pycurl.HTTPHEADER,["Authorization: Basic " + passwd64])
+        curl.setopt(pycurl.HTTPHEADER,["Authorization: Basic " + passwd64.decode('UTF-8')])
         curl.setopt(pycurl.USERAGENT,"Mozilla/4.0")
         curl.setopt(pycurl.USERPWD,passwd)
         curl.setopt(pycurl.POST,True)
@@ -126,4 +126,4 @@ def __init__(self):
 
 
     def callback(self,buf):
-        self.conteudo = buf        
\ No newline at end of file
+        self.conteudo = buf