diff --git a/ash.py b/ash.py
index 205b602..f66dbb0 100644
--- a/ash.py
+++ b/ash.py
@@ -2,6 +2,8 @@
 A Flask-based web server that serves Twitter Archive.
 '''
 
+from __future__ import annotations
+
 import re
 import pprint
 import itertools