diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 7156ee4e7..60a0d336d 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -76,6 +76,7 @@ class EventTypes(object):
     Feedback = "m.room.message.feedback"
 
     RoomHistoryVisibility = "m.room.history_visibility"
+    CanonicalAlias = "m.room.canonical_alias"
 
     # These are used for validation
     Message = "m.room.message"
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 7511d294f..c56112a92 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -250,6 +250,7 @@ class RoomCreationHandler(BaseHandler):
                     EventTypes.Name: 100,
                     EventTypes.PowerLevels: 100,
                     EventTypes.RoomHistoryVisibility: 100,
+                    EventTypes.CanonicalAlias: 100,
                 },
                 "events_default": 0,
                 "state_default": 50,