1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 410f4c11e7..df7fb6aab7 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -69,7 +69,7 @@ class Auth(object):
 
             if not creation_event:
                 raise SynapseError(
-                    400,
+                    403,
                     "Room %r does not exist" % (event.room_id,)
                 )