diff --git a/src/shop/models.py b/src/shop/models.py
index 3caa6a98..a262896f 100644
--- a/src/shop/models.py
+++ b/src/shop/models.py
@@ -456,7 +456,7 @@ class Ticket(CreatedUpdatedModel, UUIDModel):
                 ticket_id=self.pk,
                 user_id=self.order.user.pk,
                 secret_key=settings.SECRET_KEY,
-            )
+            ).encode('utf-8')
         ).hexdigest()
 
     def get_qr_code(self):