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-rw-r--r--synapse/api/constants.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 12d18137e0..85001d9676 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 = frozenset((INVITE, JOIN, KNOCK, LEAVE, BAN))
 
 
 class PresenceState: