diff --git a/synapse/app/synchrotron.py b/synapse/app/synchrotron.py
index 3cade3c68e..67a2d2b7db 100644
--- a/synapse/app/synchrotron.py
+++ b/synapse/app/synchrotron.py
@@ -214,6 +214,8 @@ class SynchrotronPresence(object):
         yield self.notify_from_replication(states, stream_id)
 
     def get_currently_syncing_users(self):
+        # presence is disabled on matrix.org, so we return the empty set
+        return set()
         return [
             user_id for user_id, count in iteritems(self.user_to_num_current_syncs)
             if count > 0
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index c7336020a2..95953efb08 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -467,6 +467,7 @@ class PresenceHandler(object):
         Returns:
             set(str): A set of user_id strings.
         """
+        # presence is disabled on matrix.org, so we return the empty set
         return set()
         syncing_user_ids = {
             user_id for user_id, count in self.user_to_num_current_syncs.items()