diff --git a/app/services/memos_service.rb b/app/services/memos_service.rb
index 1ed7b1706..6ff7ef20c 100644
--- a/app/services/memos_service.rb
+++ b/app/services/memos_service.rb
@@ -402,7 +402,7 @@ class MemosService
       memo = Memo.find params[:id]
       return { status: 404 } if memo.hidden? && (!current_user || !(current_user.admin? || current_user.id == memo.author_id))
       memo.update_attributes(params[:memo])
-      memo.update_attachments(params[:attachments]) if params[:attachments].present?
+      memo.update_attachments(params[:attachments])
       memo.forum_section_id = params[:children_forum_id].present? ? params[:children_forum_id] : params[:forum_id]
       if memo.save!
         if params[:attachment_id]