diff --git a/rollup.config.js b/rollup.config.js
index eb75988..b1fe0dd 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -4,7 +4,7 @@ let mode = join(__dirname, "mode")
 
 module.exports = readdirSync(mode).filter(f => /\.js$/.test(f)).map(f => ({
   input: join(mode, f),
-  output: [{
+  output: {
     file: join(mode, f.replace(/\.js$/, ".cjs")),
     format: "cjs"
   },