diff --git a/lib/6to5/polyfill.js b/lib/6to5/polyfill.js
new file mode 100644
index 0000000000..1b9ee87bcd
--- /dev/null
+++ b/lib/6to5/polyfill.js
@@ -0,0 +1,2 @@
+require("es6-symbol/implement");
+require("es6-shim");
diff --git a/lib/6to5/register.js b/lib/6to5/register.js
index 4093bfc937..f2e1a54dd9 100644
--- a/lib/6to5/register.js
+++ b/lib/6to5/register.js
@@ -1,3 +1,5 @@
+require("./polyfill");
+
 var maps = {};
 var old  = require.extensions[".js"];
 
diff --git a/package.json b/package.json
index f2fc50fd86..f3c273bd75 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,8 @@
     "estraverse": "1.5.1",
     "fs-readdir-recursive": "0.0.2",
     "lodash": "2.4.1",
-    "mkdirp": "0.5.0"
+    "mkdirp": "0.5.0",
+    "es6-shim": "^0.18.0"
   },
   "devDependencies": {
     "mocha": "1.21.4",
diff --git a/polyfill.js b/polyfill.js
new file mode 100644
index 0000000000..65a4b63946
--- /dev/null
+++ b/polyfill.js
@@ -0,0 +1 @@
+require("./lib/6to5/polyfill");