diff --git a/scripts/build.js b/scripts/build.js
index 94edff581619..f107d14342a7 100644
--- a/scripts/build.js
+++ b/scripts/build.js
@@ -74,27 +74,25 @@ function buildNodePackage(p) {
   process.stdout.write(`[  ${chalk.green('OK')}  ]\n`);
 }
 
-async function buildBrowserPackages(packages) {
-  for (const p of packages) {
-    const srcDir = path.resolve(p, SRC_DIR);
-    const pkgJsonPath = path.resolve(p, 'package.json');
-
-    const {browser} = require(pkgJsonPath);
-    if (browser) {
-      if (browser.indexOf(BUILD_ES5_DIR) !== 0) {
-        throw new Error(
-          `browser field for ${pkgJsonPath} should start with "${BUILD_ES5_DIR}"`
-        );
-      }
-      process.stdout.write(fixedWidth(`${path.basename(p)}\n`));
-      await browserBuild(
-        path.resolve(srcDir, 'index.js'),
-        path.resolve(p, browser)
+function buildBrowserPackage(p) {
+  const srcDir = path.resolve(p, SRC_DIR);
+  const pkgJsonPath = path.resolve(p, 'package.json');
+
+  const {browser} = require(pkgJsonPath);
+  if (browser) {
+    if (browser.indexOf(BUILD_ES5_DIR) !== 0) {
+      throw new Error(
+        `browser field for ${pkgJsonPath} should start with "${BUILD_ES5_DIR}"`
       );
-      process.stdout.write(`[  ${chalk.green('OK')}  ]\n`);
     }
+    browserBuild(
+      path.resolve(srcDir, 'index.js'),
+      path.resolve(p, browser)
+    ).then(() => {
+      process.stdout.write(fixedWidth(`${path.basename(p)}\n`));
+      process.stdout.write(`[  ${chalk.green('OK')}  ]\n`);
+    });
   }
-  process.stdout.write('\n');
 }
 
 function buildFile(file, silent) {
@@ -144,5 +142,5 @@ if (files.length) {
   process.stdout.write('\n');
 
   process.stdout.write(chalk.bold.inverse('Building browser packages\n'));
-  buildBrowserPackages(packages);
+  packages.forEach(buildBrowserPackage);
 }