diff --git a/Lib/test/test_sax.py b/Lib/test/test_sax.py
index 0d76cbb..e2639fa 100644
--- a/Lib/test/test_sax.py
+++ b/Lib/test/test_sax.py
@@ -12,7 +12,7 @@
                              XMLFilterBase
 from xml.sax.expatreader import create_parser
 from xml.sax.xmlreader import InputSource, AttributesImpl, AttributesNSImpl
-from cStringIO import StringIO
+from io import StringIO
 from test.test_support import findfile, run_unittest
 import unittest
 import os