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-rw-r--r--synapse/storage/prepare_database.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/storage/prepare_database.py b/synapse/storage/prepare_database.py
index 9275253277..598ded33b5 100644
--- a/synapse/storage/prepare_database.py
+++ b/synapse/storage/prepare_database.py
@@ -25,6 +25,7 @@ from typing import (
     Optional,
     TextIO,
     Tuple,
+    cast,
 )
 
 import attr
@@ -732,7 +733,7 @@ def _get_or_create_schema_state(
     applied_deltas = tuple(d for d, in txn)
 
     txn.execute("SELECT update_name, ordering FROM background_updates")
-    background_Updates = tuple(txn)
+    background_Updates = cast(Tuple[Tuple[str, int], ...], tuple(txn))
 
     return _SchemaState(
         current_version=current_version,