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-rw-r--r--synapse/storage/databases/main/cache.py7
1 files changed, 5 insertions, 2 deletions
diff --git a/synapse/storage/databases/main/cache.py b/synapse/storage/databases/main/cache.py
index c57ae5ef15..36e8422fc6 100644
--- a/synapse/storage/databases/main/cache.py
+++ b/synapse/storage/databases/main/cache.py
@@ -15,7 +15,7 @@
 
 import itertools
 import logging
-from typing import Any, Iterable, List, Optional, Tuple
+from typing import TYPE_CHECKING, Any, Iterable, List, Optional, Tuple
 
 from synapse.api.constants import EventTypes
 from synapse.replication.tcp.streams import BackfillStream, CachesStream
@@ -29,6 +29,9 @@ from synapse.storage.database import DatabasePool
 from synapse.storage.engines import PostgresEngine
 from synapse.util.iterutils import batch_iter
 
+if TYPE_CHECKING:
+    from synapse.server import HomeServer
+
 logger = logging.getLogger(__name__)
 
 
@@ -38,7 +41,7 @@ CURRENT_STATE_CACHE_NAME = "cs_cache_fake"
 
 
 class CacheInvalidationWorkerStore(SQLBaseStore):
-    def __init__(self, database: DatabasePool, db_conn, hs):
+    def __init__(self, database: DatabasePool, db_conn, hs: "HomeServer"):
         super().__init__(database, db_conn, hs)
 
         self._instance_name = hs.get_instance_name()