diff --git a/sanic_ext/extensions/openapi/ui/redoc.html b/sanic_ext/extensions/openapi/ui/redoc.html
index aefb672..6e57f9c 100644
--- a/sanic_ext/extensions/openapi/ui/redoc.html
+++ b/sanic_ext/extensions/openapi/ui/redoc.html
@@ -14,7 +14,7 @@
         </style>
     </head>
     <body>
-        <redoc spec-url="__URL_PREFIX____URL_CONFIG__"></redoc>
+        <redoc spec-url="__URL_PREFIX____URL_JSON__"></redoc>
         <script src="https://cdn.jsdelivr.net/npm/redoc@next/bundles/redoc.standalone.js"></script>
     </body>
 </html>
