1 files changed, 9 insertions, 1 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 22e19af17f..38e375f86a 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -21,7 +21,7 @@ from synapse.streams.config import PaginationConfig
 from synapse.events.utils import serialize_event
 from synapse.events.validator import EventValidator
 from synapse.util.logcontext import PreserveLoggingContext
-from synapse.types import UserID
+from synapse.types import UserID, RoomStreamToken
 
 from ._base import BaseHandler
 
@@ -92,6 +92,14 @@ class MessageHandler(BaseHandler):
                 yield self.hs.get_event_sources().get_current_token()
             )
 
+        room_token = RoomStreamToken.parse(pagin_config.from_token.room_key)
+        if room_token.topological is None:
+            raise SynapseError(400, "Invalid token")
+
+        yield self.hs.get_handlers().federation_handler.maybe_backfill(
+            room_id, room_token.topological
+        )
+
         user = UserID.from_string(user_id)
 
         events, next_key = yield data_source.get_pagination_rows(