diff --git a/registration/views.py b/registration/views.py
index 30b9eef..e74c337 100644
--- a/registration/views.py
+++ b/registration/views.py
@@ -767,7 +767,8 @@ class ReceiptView(LoginRequiredMixin, View):
         mime_type = mime.from_file(path)
         ext = mime_type.split("/")[1].replace("jpeg", "jpg")
         # Replace file name
-        true_file_name = _("Payment receipt of {user}.{ext}").format(user=str(user.registration), ext=ext)
+        registrations = ", ".join(str(registration) for registration in payment.registrations.all())
+        true_file_name = _("Payment receipt of {registrations}.{ext}").format(registrations=registrations, ext=ext)
         return FileResponse(open(path, "rb"), content_type=mime_type, filename=true_file_name)