1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 13b5b4da93..4bbcb52b28 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -838,7 +838,7 @@ class PresenceEventSource(object):
         updates = []
         # TODO(paul): use a DeferredList ? How to limit concurrency.
         for observed_user in cachemap.keys():
-            if not (to_key < cachemap[observed_user].serial < from_key):
+            if not (to_key < cachemap[observed_user].serial <= from_key):
                 continue
 
             if (yield self.is_visible(observer_user, observed_user)):