diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index 9cb0c4b331..461d1d489b 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -252,7 +252,7 @@ export class ClientServerService {
 			reply.header('Content-Security-Policy', 'default-src \'none\'; style-src \'unsafe-inline\'');
 
 			// || emoji.originalUrl してるのは後方互換性のため（publicUrlはstringなので??はだめ）
-			return await reply.redirect(301, emoji.publicUrl ?? emoji.originalUrl);
+			return await reply.redirect(301, emoji.publicUrl || emoji.originalUrl);
 
 			/* https://github.com/misskey-dev/misskey/pull/9431#issuecomment-1373006446
 			const url = new URL('/proxy/emoji.webp', this.config.url);