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-rw-r--r--synapse/app/_base.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/app/_base.py b/synapse/app/_base.py
index 807ee3d46e..5fc59c1be1 100644
--- a/synapse/app/_base.py
+++ b/synapse/app/_base.py
@@ -32,6 +32,7 @@ from typing import (
     Iterable,
     List,
     NoReturn,
+    Optional,
     Tuple,
     cast,
 )
@@ -129,7 +130,7 @@ def start_worker_reactor(
 def start_reactor(
     appname: str,
     soft_file_limit: int,
-    gc_thresholds: Tuple[int, int, int],
+    gc_thresholds: Optional[Tuple[int, int, int]],
     pid_file: str,
     daemonize: bool,
     print_pidfile: bool,