diff --git a/tests/test_helpers.py b/tests/test_helpers.py
index c67253aa..9b7390c3 100644
--- a/tests/test_helpers.py
+++ b/tests/test_helpers.py
@@ -1,5 +1,6 @@
 import io
 import os
+from typing import IO
 
 import pytest
 import werkzeug.exceptions