1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/api/constants.py b/synapse/api/constants.py

index 0a9123c56b..542e4faaa1 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -50,7 +50,7 @@ class Membership:
     KNOCK: Final = "knock"
     LEAVE: Final = "leave"
     BAN: Final = "ban"
-    LIST: Final = (INVITE, JOIN, KNOCK, LEAVE, BAN)
+    LIST: Final = {INVITE, JOIN, KNOCK, LEAVE, BAN}
 
 
 class PresenceState: