diff --git a/web/src/middleware.ts b/web/src/middleware.ts
index 6e933bb..36b70dc 100644
--- a/web/src/middleware.ts
+++ b/web/src/middleware.ts
@@ -10,9 +10,9 @@ export function middleware(request: NextRequest) {
   }
 
   // Protected routes: check for Logto session cookie
-  // The Logto SDK stores session data in a cookie named `logto:<appId>`
+  // The Logto SDK stores session data in a cookie named `logto_<appId>`
   const hasSession = request.cookies.getAll().some(
-    (cookie) => cookie.name.startsWith('logto:')
+    (cookie) => cookie.name.startsWith('logto_')
   );
 
   if (!hasSession && !pathname.startsWith('/auth')) {