1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/stats.py b/synapse/handlers/stats.py
index b64ce8cab8..9fc53333fc 100644
--- a/synapse/handlers/stats.py
+++ b/synapse/handlers/stats.py
@@ -68,7 +68,7 @@ class StatsHandler:
 
         self._is_processing = True
 
-        async def process():
+        async def process() -> None:
             try:
                 await self._unsafe_process()
             finally: