diff --git a/sytest-whitelist b/sytest-whitelist
index 805f0e4d..f4fb993a 100644
--- a/sytest-whitelist
+++ b/sytest-whitelist
@@ -482,3 +482,4 @@ m.room.history_visibility == "joined" allows/forbids appropriately for Real user
 POST rejects invalid utf-8 in JSON
 Users cannot kick users who have already left a room
 A prev_batch token from incremental sync can be used in the v1 messages API
+Event with an invalid signature in the send_join response should not cause room join to fail