diff --git a/core/models.py b/core/models.py
index 6bbc12d7..4631a2a0 100644
--- a/core/models.py
+++ b/core/models.py
@@ -1,7 +1,7 @@
 import datetime
 import json
 import logging
-from typing import Self
+from typing import Optional, Self
 
 from constance import config
 from django.contrib.gis.db.models import PointField
@@ -550,7 +550,8 @@ class Order(ExportModelOperationsMixin("order"), NiceModel):
     def total_quantity(self) -> int:
         return sum([op.quantity for op in self.order_products.all()])
 
-    def add_product(self, product_uuid: str | None = None, attributes: list = None, update_quantity: bool = True):
+    def add_product(self, product_uuid: str | None = None, attributes: Optional[list] = None,
+                    update_quantity: bool = True):
         if attributes is None:
             attributes = []