1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/federation/sender/transaction_manager.py b/synapse/federation/sender/transaction_manager.py
index 9bd534a313..ca768db3e9 100644
--- a/synapse/federation/sender/transaction_manager.py
+++ b/synapse/federation/sender/transaction_manager.py
@@ -51,6 +51,10 @@ 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,