diff --git a/cnab_erpbrasil_febraban/febraban/boleto/document.py b/cnab_erpbrasil_febraban/febraban/boleto/document.py
index b33e1d61eae1..3908963dd333 100644
--- a/cnab_erpbrasil_febraban/febraban/boleto/document.py
+++ b/cnab_erpbrasil_febraban/febraban/boleto/document.py
@@ -15,7 +15,7 @@
 try:
     from cStringIO import StringIO
 except ImportError:
-    from StringIO import StringIO
+    from io import StringIO
 BoletoException = bank.BoletoException