diff --git a/lib/matrix-common/events.ml b/lib/matrix-common/events.ml
index 1224014..aac9dd0 100644
--- a/lib/matrix-common/events.ml
+++ b/lib/matrix-common/events.ml
@@ -1786,7 +1786,7 @@ module State_event = struct
       let room_event, state_key = v in
       {room_event; state_key} in
     let with_tuple =
-      merge_objs Room_event.encoding (obj1 (req "state_key" string)) in
+      merge_objs Room_event.encoding (obj1 (dft "state_key" string "")) in
     conv to_tuple of_tuple with_tuple
 
   let get_event t = Room_event.get_event t.room_event
diff --git a/lib/matrix-ctos/rooms.ml b/lib/matrix-ctos/rooms.ml
index eaebc74..b9e2882 100644
--- a/lib/matrix-ctos/rooms.ml
+++ b/lib/matrix-ctos/rooms.ml
@@ -149,6 +149,6 @@ let encoding =
   let with_tuple =
     obj3
       (req "join" (assoc Joined_room.encoding))
-      (req "invite" (assoc Invited_room.encoding))
-      (req "leave" (assoc Left_room.encoding)) in
+      (dft "invite" (assoc Invited_room.encoding) [])
+      (dft "leave" (assoc Left_room.encoding) []) in
   conv to_tuple of_tuple with_tuple