diff --git a/src/server/api/endpoints/admin/update-meta.ts b/src/server/api/endpoints/admin/update-meta.ts
index 5e893c7d3..da2ee3692 100644
--- a/src/server/api/endpoints/admin/update-meta.ts
+++ b/src/server/api/endpoints/admin/update-meta.ts
@@ -82,7 +82,7 @@ export const meta = {
 		},
 
 		maxNoteTextLength: {
-			validator: $.optional.num.min(1),
+			validator: $.optional.num.min(0),
 			desc: {
 				'ja-JP': '投稿の最大文字数'
 			}