diff --git a/sqlparse/lexer.py b/sqlparse/lexer.py
index 5ada586..a053b08 100644
--- a/sqlparse/lexer.py
+++ b/sqlparse/lexer.py
@@ -16,7 +16,15 @@
 
 from sqlparse import tokens
 from sqlparse.keywords import KEYWORDS, KEYWORDS_COMMON
-from io import StringIO
+
+try:
+    # Python 3
+    from io import BytesIO as StringIO
+except (ImportError):
+    # Python 2
+    from StringIO import StringIO
+
+
 import collections