diff --git a/.changeset/css-bundle-monorepo-fix.md b/.changeset/css-bundle-monorepo-fix.md
new file mode 100644
index 00000000000..291eb9d2603
--- /dev/null
+++ b/.changeset/css-bundle-monorepo-fix.md
@@ -0,0 +1,6 @@
+---
+"remix": patch
+"@remix-run/dev": patch
+---
+
+use path.resolve when re-exporting entry.client
diff --git a/packages/remix-dev/compiler/plugins/cssBundleEntryModulePlugin.ts b/packages/remix-dev/compiler/plugins/cssBundleEntryModulePlugin.ts
index 6015691bef1..eaa62a02105 100644
--- a/packages/remix-dev/compiler/plugins/cssBundleEntryModulePlugin.ts
+++ b/packages/remix-dev/compiler/plugins/cssBundleEntryModulePlugin.ts
@@ -28,7 +28,7 @@ export function cssBundleEntryModulePlugin(config: RemixConfig): Plugin {
           contents: [
             // These need to be exports to avoid tree shaking
             `export * as entryClient from ${JSON.stringify(
-              path.relative(config.rootDirectory, config.entryClientFilePath)
+              path.resolve(config.rootDirectory, config.entryClientFilePath)
             )};`,
             ...Object.keys(config.routes).map((key, index) => {
               let route = config.routes[key];