1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/replication/http/devices.py b/synapse/replication/http/devices.py
index e32aac0a25..20f3ba76c0 100644
--- a/synapse/replication/http/devices.py
+++ b/synapse/replication/http/devices.py
@@ -60,7 +60,7 @@ class ReplicationUserDevicesResyncRestServlet(ReplicationEndpoint):
         self.clock = hs.get_clock()
 
     @staticmethod
-    def _serialize_payload(user_id):
+    async def _serialize_payload(user_id):
         return {}
 
     async def _handle_request(self, request, user_id):