diff --git a/app/timetracking/backend/vtiger_sync.py b/app/timetracking/backend/vtiger_sync.py
index b6ef9af..e9dce1e 100644
--- a/app/timetracking/backend/vtiger_sync.py
+++ b/app/timetracking/backend/vtiger_sync.py
@@ -245,7 +245,8 @@ class TimeTrackingVTigerService:
                             "elementType": "Timelog",
                             "element": {
                                 "id": vtiger_id,
-                                "billed_via_thehub_id": str(hub_order_id)
+                                "billed_via_thehub_id": str(hub_order_id),
+                                "cf_timelog_invoiced": "1"  # Marker som faktureret
                             }
                         }