diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index e043fd53228b..42afe22910ac 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -391,6 +391,10 @@ async def _update_join_states(
         if not self.hs.is_mine(target_user):
             return
 
+        # T2B: don't update membership events for discord users
+        if target_user.to_string().startswith("@_discord"):
+            return
+
         await self.request_ratelimiter.ratelimit(requester)
 
         # Do not actually update the room state for shadow-banned users.