1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/replication/tcp/streams/_base.py b/synapse/replication/tcp/streams/_base.py

index 8971a6a22e..52564136fc 100644
--- a/synapse/replication/tcp/streams/_base.py
+++ b/synapse/replication/tcp/streams/_base.py
@@ -24,7 +24,7 @@ from twisted.internet import defer
 logger = logging.getLogger(__name__)
 
 
-MAX_EVENTS_BEHIND = 10000
+MAX_EVENTS_BEHIND = 500000
 
 BackfillStreamRow = namedtuple("BackfillStreamRow", (
     "event_id",  # str