diff --git a/packages/docusaurus/src/client/preload.ts b/packages/docusaurus/src/client/preload.ts
index 4434e929fd..a4faa7750d 100644
--- a/packages/docusaurus/src/client/preload.ts
+++ b/packages/docusaurus/src/client/preload.ts
@@ -17,7 +17,7 @@ import {matchRoutes} from 'react-router-config';
  * @returns Promise object represents whether pathname has been preloaded
  */
 export default function preload(pathname: string): Promise<void[]> {
-  const matches = [pathname, decodeURI(pathname)]
+  const matches = Array.from(new Set([pathname, decodeURI(pathname)]))
     .map(p => matchRoutes(routes, p))
     .flat();