diff --git a/shop/management/commands/invoice-worker.py b/shop/management/commands/invoice-worker.py
index 4b6d8934..f3c35552 100644
--- a/shop/management/commands/invoice-worker.py
+++ b/shop/management/commands/invoice-worker.py
@@ -1,4 +1,5 @@
 from django.core.management.base import BaseCommand
+from django.core.files import File
 from django.conf import settings
 from shop.pdf import generate_pdf_letter
 from shop.email import send_invoice_email