1 files changed, 3 insertions, 2 deletions
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index c6d6aef53b..731df00648 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -136,8 +136,9 @@ class PresenceHandler(BaseHandler):
         self._user_cachemap = {}
         self._user_cachemap_latest_serial = 0
 
-        metrics.register_callback("userCachemap:size",
-            lambda: len(self._user_cachemap)
+        metrics.register_callback(
+            "userCachemap:size",
+            lambda: len(self._user_cachemap),
         )
 
     def _get_or_make_usercache(self, user):