diff --git a/services/univention-ad-connector/modules/univention/connector/ad/__init__.py b/services/univention-ad-connector/modules/univention/connector/ad/__init__.py
index 61c9fdc4b3..19580527c9 100644
--- a/services/univention-ad-connector/modules/univention/connector/ad/__init__.py
+++ b/services/univention-ad-connector/modules/univention/connector/ad/__init__.py
@@ -933,7 +933,8 @@ class ad(univention.connector.ucs):
 				return int(element[1]['uSNChanged'][0])
 
 			def _sortkey_created_since_last(element):
-				return 0 if int(element[1]['uSNCreated'][0]) > last_usn else 1
+				uSNCreated = int(element[1]['uSNCreated'][0])
+				return uSNCreated if uSNCreated > last_usn else 'X'
 
 			if last_usn <= 0:
 				return sorted(res, key=_sortkey_ascending_usncreated)