diff --git a/web/src/components/MemoView.tsx b/web/src/components/MemoView.tsx
index cab4377a8..63949735d 100644
--- a/web/src/components/MemoView.tsx
+++ b/web/src/components/MemoView.tsx
@@ -54,7 +54,7 @@ const MemoView: React.FC<Props> = (props: Props) => {
     (relation) => relation.type === MemoRelation_Type.COMMENT && relation.relatedMemo === memo.name,
   ).length;
   const relativeTimeFormat = Date.now() - memo.displayTime!.getTime() > 1000 * 60 * 60 * 24 ? "datetime" : "auto";
-  const readonly = memo.creator !== user?.name || isSuperUser(user);
+  const readonly = memo.creator !== user?.name && !isSuperUser(user);
   const isInMemoDetailPage = location.pathname.startsWith(`/m/${memo.uid}`);
 
   // Initial related data: creator.