diff --git a/thriftpy/parser/parser.py b/thriftpy/parser/parser.py
index 88e1346..7182fad 100644
--- a/thriftpy/parser/parser.py
+++ b/thriftpy/parser/parser.py
@@ -6,6 +6,7 @@
 """
 
 from __future__ import absolute_import
+from io import open
 
 import collections
 import os