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-rw-r--r--synapse/api/events/factory.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/api/events/factory.py b/synapse/api/events/factory.py
index 750096c618..9134c82eff 100644
--- a/synapse/api/events/factory.py
+++ b/synapse/api/events/factory.py
@@ -69,6 +69,10 @@ class EventFactory(object):
         kwargs["type"] = etype
         if "event_id" not in kwargs:
             kwargs["event_id"] = self.create_event_id()
+            kwargs["origin"] = self.hs.hostname
+        else:
+            ev_id = self.hs.parse_eventid(kwargs["event_id"])
+            kwargs["origin"] = ev_id.domain
 
         if "origin_server_ts" not in kwargs:
             kwargs["origin_server_ts"] = int(self.clock.time_msec())