diff --git a/tslib.js b/tslib.js
index 5fe3931..e666988 100644
--- a/tslib.js
+++ b/tslib.js
@@ -42,11 +42,13 @@ var __makeTemplateObject;
         factory(createExporter(root));
     }
     function createExporter(exports, previous) {
-        if (typeof Object.create === "function") {
-            Object.defineProperty(exports, "__esModule", { value: true });
-        }
-        else {
-            exports.__esModule = true;
+        if (exports !== root) {
+            if (typeof Object.create === "function") {
+                Object.defineProperty(exports, "__esModule", { value: true });
+            }
+            else {
+                exports.__esModule = true;
+            }
         }
         return function (id, v) { return exports[id] = previous ? previous(id, v) : v; };
     }