diff --git a/src/client/app/utils.ts b/src/client/app/utils.ts
index f6438cc17a83..33e0684bb3e3 100644
--- a/src/client/app/utils.ts
+++ b/src/client/app/utils.ts
@@ -1,6 +1,8 @@
 import { siteDataRef } from './data'
 import { inBrowser } from '../shared'
 
+const EXTERNAL_URL_RE = /^https?:/i
+
 export { inBrowser }
 
 /**
@@ -11,7 +13,9 @@ export function joinPath(base: string, path: string): string {
 }
 
 export function withBase(path: string) {
-  return joinPath(siteDataRef.value.base, path)
+  return EXTERNAL_URL_RE.test(path)
+    ? path
+    : joinPath(siteDataRef.value.base, path)
 }
 
 /**