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-rw-r--r--synapse/util/caches/descriptors.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/util/caches/descriptors.py b/synapse/util/caches/descriptors.py
index 1e8e6b1d01..1ca31e41ac 100644
--- a/synapse/util/caches/descriptors.py
+++ b/synapse/util/caches/descriptors.py
@@ -413,7 +413,7 @@ class DeferredCacheListDescriptor(_CacheDescriptorBase):
                 # relevant result for that key.
                 deferreds_map = {}
                 for arg in missing:
-                    deferred = defer.Deferred()
+                    deferred: "defer.Deferred[Any]" = defer.Deferred()
                     deferreds_map[arg] = deferred
                     key = arg_to_cache_key(arg)
                     cache.set(key, deferred, callback=invalidate_callback)