diff --git a/synapse/replication/http/send_event.py b/synapse/replication/http/send_event.py
index 70f2fe456a..bbe2f967b7 100644
--- a/synapse/replication/http/send_event.py
+++ b/synapse/replication/http/send_event.py
@@ -25,7 +25,7 @@ from synapse.util.async import sleep
from synapse.util.caches.response_cache import ResponseCache
from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
from synapse.util.metrics import Measure
-from synapse.types import Requester
+from synapse.types import Requester, UserID
import logging
import re
@@ -46,7 +46,7 @@ def send_event_to_master(client, host, port, requester, event, context,
event (FrozenEvent)
context (EventContext)
ratelimit (bool)
- extra_users (list(str)): Any extra users to notify about event
+ extra_users (list(UserID)): Any extra users to notify about event
"""
uri = "http://%s:%s/_synapse/replication/send_event/%s" % (
host, port, event.event_id,
@@ -59,7 +59,7 @@ def send_event_to_master(client, host, port, requester, event, context,
"context": context.serialize(event),
"requester": requester.serialize(),
"ratelimit": ratelimit,
- "extra_users": extra_users,
+ "extra_users": [u.to_string() for u in extra_users],
}
try:
@@ -143,7 +143,7 @@ class ReplicationSendEventRestServlet(RestServlet):
context = yield EventContext.deserialize(self.store, content["context"])
ratelimit = content["ratelimit"]
- extra_users = content["extra_users"]
+ extra_users = [UserID.from_string(u) for u in content["extra_users"]]
if requester.user:
request.authenticated_entity = requester.user.to_string()
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