diff --git a/hack/boilerplate/boilerplate_test.py b/hack/boilerplate/boilerplate_test.py
index b8d5b8e9e0f..66453045f76 100644
--- a/hack/boilerplate/boilerplate_test.py
+++ b/hack/boilerplate/boilerplate_test.py
@@ -16,7 +16,7 @@
 
 import boilerplate
 import unittest
-import StringIO
+from io import StringIO
 import os
 import sys