diff --git a/packages/cli/src/index.ts b/packages/cli/src/index.ts
index 50f3efd516..44a6455c7c 100644
--- a/packages/cli/src/index.ts
+++ b/packages/cli/src/index.ts
@@ -104,7 +104,7 @@ export async function build(_options: CliOptions) {
   async function generate(options: ResolvedCliOptions) {
     const outFile = resolve(options.cwd || process.cwd(), options.outFile ?? 'uno.css')
     const { css, matched } = await uno.generate(
-      [...fileCache].join('\n'),
+      [...fileCache.values()].join('\n'),
       {
         preflights: options.preflights,
         minify: options.minify,