diff --git a/plugins/css_bundler/src/builder.ts b/plugins/css_bundler/src/builder.ts
index 077ab95..9e09875 100644
--- a/plugins/css_bundler/src/builder.ts
+++ b/plugins/css_bundler/src/builder.ts
@@ -47,7 +47,7 @@ export async function builder(
 
 				// const { code, map } = await builder({ filename: url.toString(), assetDir, dev })
 
-				const filepath = join(assetDir, filename)
+				const filepath = join(assetDir, `${filename}.css`)
 				await Deno.writeFile(filepath, new Uint8Array(file))
 				cssImports.set(`${from}/${specifier}`, filepath)
 				return filepath