1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/api/events/factory.py b/synapse/api/events/factory.py
index c6d1151cac..06f3bf232b 100644
--- a/synapse/api/events/factory.py
+++ b/synapse/api/events/factory.py
@@ -66,8 +66,8 @@ class EventFactory(object):
         if "event_id" not in kwargs:
             kwargs["event_id"] = self.create_event_id()
 
-        if "ts" not in kwargs:
-            kwargs["ts"] = int(self.clock.time_msec())
+        if "origin_server_ts" not in kwargs:
+            kwargs["origin_server_ts"] = int(self.clock.time_msec())
 
         # The "age" key is a delta timestamp that should be converted into an
         # absolute timestamp the minute we see it.