diff --git a/misp_stix_converter/stix2misp/stix2_to_misp.py b/misp_stix_converter/stix2misp/stix2_to_misp.py
index c8a33f23..6eb3be0d 100644
--- a/misp_stix_converter/stix2misp/stix2_to_misp.py
+++ b/misp_stix_converter/stix2misp/stix2_to_misp.py
@@ -1200,7 +1200,7 @@ def _parse_markings(self, marking_refs: list):
             except ObjectRefLoadingError as error:
                 self._object_ref_loading_error(error)
                 continue
-            yield(marking_definition)
+            yield marking_definition
 
     def _parse_timeline(self, stix_object: _SDO_TYPING) -> dict:
         misp_object = {