diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index 6f804672aec0..b6f662356e98 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -189,7 +189,7 @@ export class ClientServerService {
 		// Authenticate
 		fastify.addHook('onRequest', async (request, reply) => {
 			// %71ueueとかでリクエストされたら困るため
-			const url = decodeURI(request.routerPath);
+			const url = decodeURI(request.routeOptions.url);
 			if (url === bullBoardPath || url.startsWith(bullBoardPath + '/')) {
 				const token = request.cookies.token;
 				if (token == null) {