diff --git a/app/views/memos/_memo.json.jbuilder b/app/views/memos/_memo.json.jbuilder
index f0ac5cd3d..f0d2c147f 100644
--- a/app/views/memos/_memo.json.jbuilder
+++ b/app/views/memos/_memo.json.jbuilder
@@ -1,5 +1,6 @@
 json.memo do
   json.id memo.id
+  json.forum_id memo.forum_id
   json.subject memo.subject
   json.is_md memo.is_md
   json.content memo.content