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-rw-r--r--synapse/handlers/federation_event.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 612e5aaa5b..91d1439191 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -23,6 +23,7 @@ from typing import (
     Dict,
     Iterable,
     List,
+    Optional,
     Sequence,
     Set,
     Tuple,