diff --git a/.gitignore b/.gitignore
index 491fc35..92b258f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules
 lib
+ts-test/test.js
diff --git a/es/index.js b/es/index.js
index dacce17..548ba11 100644
--- a/es/index.js
+++ b/es/index.js
@@ -1,11 +1,14 @@
 /* global window */
 import ponyfill from './ponyfill';
 
-let root = this;
+var root = this;
 if (typeof global !== 'undefined') {
 	root = global;
 } else if (typeof window !== 'undefined') {
 	root = window;
 }
 
-export default ponyfill(root);
+var result = ponyfill(root);
+// being explicit
+result['default'] = result;
+export default result;
diff --git a/index.d.ts b/index.d.ts
index e5dd040..6816a1d 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,2 +1,2 @@
 declare const observableSymbol: symbol;
-export = observableSymbol;
\ No newline at end of file
+export default observableSymbol;
diff --git a/package.json b/package.json
index fd6ff64..dbf9350 100644
--- a/package.json
+++ b/package.json
@@ -12,8 +12,8 @@
     "node": ">=0.10.0"
   },
   "scripts": {
+    "test": "npm run build && mocha && tsc ./ts-test/test.ts && node ./ts-test/test.js",
     "build": "babel es --out-dir lib",
-    "test": "npm run build && mocha",
     "prepublish": "npm test"
   },
   "files": [
@@ -38,6 +38,7 @@
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-preset-es2015": "^6.9.0",
     "chai": "^3.5.0",
-    "mocha": "^2.4.5"
+    "mocha": "^2.4.5",
+    "typescript": "^1.8.10"
   }
 }
diff --git a/ts-test/test.ts b/ts-test/test.ts
new file mode 100644
index 0000000..69e8c4b
--- /dev/null
+++ b/ts-test/test.ts
@@ -0,0 +1,9 @@
+import $$symbolObservable from '../';
+
+console.log('***********************');
+console.log('RUNNING TYPESCRIPT TEST');
+console.log('***********************');
+
+if (typeof $$symbolObservable !== 'symbol' && <any>$$symbolObservable !== '@@observable') {
+  throw new Error('Sorry, $symbolObservable is ' + JSON.stringify($$symbolObservable));
+}