diff --git a/src/pretix/control/views/vouchers.py b/src/pretix/control/views/vouchers.py
index 3a55fe26e..2177d34e6 100644
--- a/src/pretix/control/views/vouchers.py
+++ b/src/pretix/control/views/vouchers.py
@@ -143,7 +143,7 @@ class VoucherDelete(EventPermissionRequiredMixin, DeleteView):
             messages.error(request, _('A voucher can not be deleted if it already has been redeemed.'))
         else:
             self.object.log_action('pretix.voucher.deleted', user=self.request.user)
-            CartPosition.objects.filter(addon_to__voucher=False).delete()
+            CartPosition.objects.filter(addon_to__voucher=self.object).delete()
             self.object.cartposition_set.all().delete()
             self.object.delete()
             messages.success(request, _('The selected voucher has been deleted.'))