diff --git a/biscuit/apps/chronos/views.py b/biscuit/apps/chronos/views.py
index 726530bd24beaff5a876cd62522f6d4e4dbd7d32..ef3db9f33c8a8afc88560871bf8d6c8ec9c5dab8 100644
--- a/biscuit/apps/chronos/views.py
+++ b/biscuit/apps/chronos/views.py
@@ -1,6 +1,7 @@
 from collections import OrderedDict
 from datetime import date, timedelta
 
+from typing import Optional
 from django.contrib.auth.decorators import login_required
 from django.db.models import Max, Min
 from django.http import HttpRequest, HttpResponse