diff --git a/alkatorapi/views.py b/alkatorapi/views.py
index 35bb342..4e9f58e 100644
--- a/alkatorapi/views.py
+++ b/alkatorapi/views.py
@@ -277,7 +277,7 @@ web: https://alkator.cz""",
             {
                 'user': user,
                 'invoice': invoice,
-                'products': InvoiceProduct.filter(invoice=invoice),
+                'products': InvoiceProduct.objects.filter(invoice=invoice),
                 'paid_date': racer.register_date + timedelta(days=1),
             }
         )