diff --git a/biscuit/apps/exlibris/views.py b/biscuit/apps/exlibris/views.py
index 9f246d7ed3b49db12a6556afc388c61e480f6d51..a291d723f32dbaca84f4adb550e1c4004192805b 100644
--- a/biscuit/apps/exlibris/views.py
+++ b/biscuit/apps/exlibris/views.py
@@ -1,6 +1,7 @@
 from io import BytesIO
 import os
 from tempfile import TemporaryDirectory
+from typing import Optional
 
 from django.contrib.auth.decorators import login_required
 from django.http import FileResponse, HttpRequest, HttpResponse