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-rw-r--r--synapse/federation/sender/__init__.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/federation/sender/__init__.py b/synapse/federation/sender/__init__.py
index b328a4df09..99ce73e081 100644
--- a/synapse/federation/sender/__init__.py
+++ b/synapse/federation/sender/__init__.py
@@ -453,7 +453,9 @@ class FederationSender(object):
         """Given a list of states populate self.pending_presence_by_dest and
         poke to send a new transaction to each destination
         """
-        hosts_and_states = yield get_interested_remotes(self.store, states, self.state)
+        hosts_and_states = yield defer.ensureDeferred(
+            get_interested_remotes(self.store, states, self.state)
+        )
 
         for destinations, states in hosts_and_states:
             for destination in destinations: