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-rw-r--r--synapse/util/caches/lrucache.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/util/caches/lrucache.py b/synapse/util/caches/lrucache.py
index 0eed53d3f4..1a2c2d4c0b 100644
--- a/synapse/util/caches/lrucache.py
+++ b/synapse/util/caches/lrucache.py
@@ -283,7 +283,7 @@ class LruCache(Generic[KT, VT]):
                 return value
 
         @overload
-        def cache_pop(key: KT, default: Literal[None] = None) -> Union[None, VT]:
+        def cache_pop(key: KT, default: Literal[None] = None) -> Optional[VT]:
             ...
 
         @overload