diff --git a/misp_stix_converter/stix2misp/stix2_to_misp.py b/misp_stix_converter/stix2misp/stix2_to_misp.py
index 22c03ab..05dbc8e 100644
--- a/misp_stix_converter/stix2misp/stix2_to_misp.py
+++ b/misp_stix_converter/stix2misp/stix2_to_misp.py
@@ -2,6 +2,7 @@
 # -*- coding: utf-8 -*-
 
 import sys
+from __future__ import annotations
 from .exceptions import (
     MarkingDefinitionLoadingError, ObjectRefLoadingError,
     ObjectTypeLoadingError, SynonymsResourceJSONError,