1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py
index e676c2cac4..f968706334 100644
--- a/synapse/util/caches/__init__.py
+++ b/synapse/util/caches/__init__.py
@@ -116,7 +116,7 @@ def register_cache(
     """
     if resizable:
         if not resize_callback:
-            resize_callback = getattr(cache, "set_cache_factor")
+            resize_callback = cache.set_cache_factor  # type: ignore
         add_resizable_cache(cache_name, resize_callback)
 
     metric = CacheMetric(cache, cache_type, cache_name, collect_callback)