diff --git a/synapse/storage/databases/main/events_worker.py b/synapse/storage/databases/main/events_worker.py
index 21b48d15bb5f..40f806b0b051 100644
--- a/synapse/storage/databases/main/events_worker.py
+++ b/synapse/storage/databases/main/events_worker.py
@@ -249,7 +249,7 @@ def __init__(
         # TODO: temporary explicit disable of this cache due to thrashing requests
         # burning CPU. Possibly need to move this cache to where we get events from DB.
         if external_sharded_cache.is_enabled() and False:
-            self._get_event_cache = RedisLruCache(
+            self._get_event_cache = RedisLruCache(  # type: ignore
                 cache_name="*getEvent*",
                 max_size=hs.config.caches.event_cache_size,
                 redis_shard_cache=external_sharded_cache,