diff --git a/packages/docusaurus/src/commands/serve.ts b/packages/docusaurus/src/commands/serve.ts
index 9d0000bb7210..e2446abea84b 100644
--- a/packages/docusaurus/src/commands/serve.ts
+++ b/packages/docusaurus/src/commands/serve.ts
@@ -80,7 +80,7 @@ export async function serve(
     if (baseUrl !== '/') {
       // Not super robust, but should be good enough for our use case
       // See https://github.com/facebook/docusaurus/pull/10090
-      const looksLikeAsset = !!req.url.match(/.[a-z]{1,4}$/);
+      const looksLikeAsset = !!req.url.match(/.[a-zA-Z\d]{1,4}$/);
       if (!looksLikeAsset) {
         const normalizedUrl = applyTrailingSlash(req.url, {
           trailingSlash,