1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/notifier.py b/synapse/notifier.py
index c87eb748c0..c3ecf86ec4 100644
--- a/synapse/notifier.py
+++ b/synapse/notifier.py
@@ -764,6 +764,13 @@ class Notifier:
 
     async def wait_for_stream_token(self, stream_token: StreamToken) -> bool:
         """Wait for this worker to catch up with the given stream token."""
+        current_token = self.event_sources.get_current_token()
+        if stream_token.is_before_or_eq(current_token):
+            return True
+
+        # Work around a bug where older Synapse versions gave out tokens "from
+        # the future", i.e. that are ahead of the tokens persisted in the DB.
+        stream_token = await self.event_sources.bound_future_token(stream_token)
 
         start = self.clock.time_msec()
         while True: