diff --git a/db/migrate/20190823063747_modify_contents_for_old_message_details.rb b/db/migrate/20190823063747_modify_contents_for_old_message_details.rb
index fc163515e..4607881fe 100644
--- a/db/migrate/20190823063747_modify_contents_for_old_message_details.rb
+++ b/db/migrate/20190823063747_modify_contents_for_old_message_details.rb
@@ -5,7 +5,7 @@ class ModifyContentsForOldMessageDetails < ActiveRecord::Migration[5.2]
       m.update_column(:is_md, true)
       message_detail = m.message_detail
       if message_detail
-        content = OldMessageDetail.find_by(message_detail.id)&.content
+        content = OldMessageDetail.find_by_id(message_detail.id)&.content
         message_detail.update_column(:content, content)
       end
     end