diff --git a/.changeset/late-squids-feel.md b/.changeset/late-squids-feel.md
new file mode 100644
index 0000000000..f527152c8b
--- /dev/null
+++ b/.changeset/late-squids-feel.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-proxy-backend': patch
+---
+
+correct rewrite rule to avoid extra subpath in proxy path
diff --git a/plugins/proxy-backend/src/service/router.ts b/plugins/proxy-backend/src/service/router.ts
index e58bccd7af..3fb33eb572 100644
--- a/plugins/proxy-backend/src/service/router.ts
+++ b/plugins/proxy-backend/src/service/router.ts
@@ -292,8 +292,7 @@ export async function createRouter(
     logger: options.logger,
   };
 
-  const externalUrl = await options.discovery.getExternalBaseUrl('proxy');
-  const { pathname: pathPrefix } = new URL(externalUrl);
+  const pathPrefix = '/api/proxy';
 
   const proxyConfig: ProxyConfig = {
     ...(options.additionalEndpoints ?? {}),