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-rw-r--r--synapse/util/caches/expiringcache.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/util/caches/expiringcache.py b/synapse/util/caches/expiringcache.py
index 6a7e534576..67ee4c693b 100644
--- a/synapse/util/caches/expiringcache.py
+++ b/synapse/util/caches/expiringcache.py
@@ -159,7 +159,7 @@ class ExpiringCache(Generic[KT, VT]):
             self[key] = value
             return value
 
-    def _prune_cache(self) -> None:
+    async def _prune_cache(self) -> None:
         if not self._expiry_ms:
             # zero expiry time means don't expire. This should never get called
             # since we have this check in start too.