1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py
index ca36f07c20..9012034b7a 100644
--- a/synapse/util/caches/__init__.py
+++ b/synapse/util/caches/__init__.py
@@ -29,8 +29,8 @@ logger = logging.getLogger(__name__)
TRACK_MEMORY_USAGE = False
-caches_by_name = {} # type: Dict[str, Sized]
-collectors_by_name = {} # type: Dict[str, CacheMetric]
+caches_by_name: Dict[str, Sized] = {}
+collectors_by_name: Dict[str, "CacheMetric"] = {}
cache_size = Gauge("synapse_util_caches_cache:size", "", ["name"])
cache_hits = Gauge("synapse_util_caches_cache:hits", "", ["name"])
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