diff --git a/packages/commonjs/README.md b/packages/commonjs/README.md
index f2803e530..3024b1e43 100644
--- a/packages/commonjs/README.md
+++ b/packages/commonjs/README.md
@@ -299,7 +299,18 @@ For these situations, you can change Rollup's behaviour either globally or per m
   import * as dep$1 from 'dep';
 
   function getAugmentedNamespace(n) {
-    var a = Object.defineProperty({}, '__esModule', { value: true });
+    if (n.__esModule) return n;
+    var f = n.default;
+    if (typeof f == 'function') {
+      var a = function a() {
+        if (this instanceof a) {
+          return Reflect.construct(f, arguments, this.constructor);
+        }
+        return f.apply(this, arguments);
+      };
+      a.prototype = f.prototype;
+    } else a = {};
+    Object.defineProperty(a, '__esModule', { value: true });
     Object.keys(n).forEach(function (k) {
       var d = Object.getOwnPropertyDescriptor(n, k);
       Object.defineProperty(