diff --git a/package.json b/package.json
index 7ddec5f..f2be2e0 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "asyncro": "^3.0.0",
     "autoprefixer": "^9.0.0",
     "babel-polyfill": "^6.26.0",
-    "brotli-size": "^0.0.2",
+    "brotli-size": "^0.0.3",
     "camelcase": "^5.0.0",
     "chalk": "^2.4.0",
     "cssnano": "^4.0.0",
diff --git a/src/index.js b/src/index.js
index 71ec88b..5f10f41 100644
--- a/src/index.js
+++ b/src/index.js
@@ -153,7 +153,7 @@ export default async function microbundle(options) {
 
 	async function getSizeInfo(code, filename) {
 		const gzip = formatSize(await gzipSize(code), filename, 'gz');
-		const brotli = formatSize(brotliSize.sync(code), filename, 'br');
+		const brotli = formatSize(await brotliSize(code), filename, 'br');
 		return gzip + '\n' + brotli;
 	}