diff --git a/packages/next/next-server/lib/router/utils/parse-relative-url.ts b/packages/next/next-server/lib/router/utils/parse-relative-url.ts
index 6475ea6630fa5a..d7a709d426cc76 100644
--- a/packages/next/next-server/lib/router/utils/parse-relative-url.ts
+++ b/packages/next/next-server/lib/router/utils/parse-relative-url.ts
@@ -23,7 +23,9 @@ export function parseRelativeUrl(url: string, base?: string) {
   } = new URL(url, resolvedBase)
   if (
     origin !== DUMMY_BASE.origin ||
-    (protocol !== 'http:' && protocol !== 'https:')
+    (protocol !== 'http:' &&
+      protocol !== 'https:' &&
+      protocol !== DUMMY_BASE.protocol)
   ) {
     throw new Error('invariant: invalid relative URL')
   }