1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 0f10c3e9b1..c86d3177e9 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1528,7 +1528,10 @@ class FederationHandler(BaseHandler):
 
         event.signatures.update(
             compute_event_signature(
-                event.get_pdu_json(), self.hs.hostname, self.hs.config.signing_key[0]
+                room_version,
+                event.get_pdu_json(),
+                self.hs.hostname,
+                self.hs.config.signing_key[0],
             )
         )