diff --git a/api/server-server/joins.yaml b/api/server-server/joins.yaml
index d4a7ed9e..09714724 100644
--- a/api/server-server/joins.yaml
+++ b/api/server-server/joins.yaml
@@ -71,7 +71,6 @@ paths:
                   type:
                     type: string
                     description: The value ``m.room.member``
-                    required: true
                     example: "m.room.member"
                   state_key:
                     type: string