diff --git a/.changeset/three-trainers-fetch.md b/.changeset/three-trainers-fetch.md
new file mode 100644
index 00000000..fd1c8c3b
--- /dev/null
+++ b/.changeset/three-trainers-fetch.md
@@ -0,0 +1,5 @@
+---
+"vinxi": patch
+---
+
+fix: css asset href is relative
diff --git a/packages/vinxi/lib/manifest/prod-server-manifest.js b/packages/vinxi/lib/manifest/prod-server-manifest.js
index e24a5c1b..5ad9024b 100644
--- a/packages/vinxi/lib/manifest/prod-server-manifest.js
+++ b/packages/vinxi/lib/manifest/prod-server-manifest.js
@@ -14,7 +14,7 @@ function createHtmlTagsForAssets(router, app, assets) {
 		.map((asset) => ({
 			tag: "link",
 			attrs: {
-				href: joinURL(app.config.server.baseURL ?? "", router.base, asset),
+				href: joinURL(app.config.server.baseURL ?? "/", router.base, asset),
 				key: join(app.config.server.baseURL ?? "", router.base, asset),
 				...(asset.endsWith(".css")
 					? { rel: "stylesheet", precendence: "high" }