--- a/ForgeTracker/forgetracker/model/ticket.py
+++ b/ForgeTracker/forgetracker/model/ticket.py
@@ -320,6 +320,7 @@
 
     def __json__(self):
         return dict(
+            _id=str(self._id),
             created_date=self.created_date,
             super_id=self.super_id,
             sub_ids=self.sub_ids,