1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/federation/sender/transaction_manager.py b/synapse/federation/sender/transaction_manager.py
index a2752a54a5..fa6ad9efdc 100644
--- a/synapse/federation/sender/transaction_manager.py
+++ b/synapse/federation/sender/transaction_manager.py
@@ -52,6 +52,10 @@ class TransactionManager(object):
         # HACK to get unique tx id
         self._next_txn_id = int(self.clock.time_msec())
 
+        # the federation sender sometimes sets this to delay transaction transmission,
+        # if the sender gets behind.
+        self.deprioritise_transmission = False
+
     @measure_func("_send_new_transaction")
     async def send_new_transaction(
         self, destination: str, pending_pdus: List[EventBase], pending_edus: List[Edu]