diff --git a/lib/build.js b/lib/build.js
index f49e5d91..f0b126f9 100644
--- a/lib/build.js
+++ b/lib/build.js
@@ -77,7 +77,8 @@ function webpackConfig(dir, {userWebpackConfig, useBabelrc} = {}) {
   var webpackConfig = {
     mode: webpackMode,
     resolve: {
-      extensions: ['.wasm', '.mjs', '.js', '.json', '.ts']
+      extensions: ['.wasm', '.mjs', '.js', '.json', '.ts'],
+      mainFields: ['module', 'main']
     },
     module: {
       rules: [