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-rw-r--r--synapse/replication/tcp/client.py4
1 files changed, 1 insertions, 3 deletions
diff --git a/synapse/replication/tcp/client.py b/synapse/replication/tcp/client.py
index 2618eb1e53..3455839d67 100644
--- a/synapse/replication/tcp/client.py
+++ b/synapse/replication/tcp/client.py
@@ -108,9 +108,7 @@ class ReplicationDataHandler:
 
         # Map from stream to list of deferreds waiting for the stream to
         # arrive at a particular position. The lists are sorted by stream position.
-        self._streams_to_waiters = (
-            {}
-        )  # type: Dict[str, List[Tuple[int, Deferred[None]]]]
+        self._streams_to_waiters = {}  # type: Dict[str, List[Tuple[int, Deferred]]]
 
     async def on_rdata(
         self, stream_name: str, instance_name: str, token: int, rows: list