diff --git a/pre_commit_hooks/detect_aws_credentials.py b/pre_commit_hooks/detect_aws_credentials.py
index e965c21..96ec49b 100644
--- a/pre_commit_hooks/detect_aws_credentials.py
+++ b/pre_commit_hooks/detect_aws_credentials.py
@@ -3,6 +3,7 @@ from __future__ import unicode_literals
 
 import argparse
 import os
+import io
 from typing import Dict
 from typing import List
 from typing import Optional