diff --git a/lib/6to5/runtime.js b/lib/6to5/runtime.js
index 3a2675b3ee..39ac7ba908 100644
--- a/lib/6to5/runtime.js
+++ b/lib/6to5/runtime.js
@@ -11,16 +11,7 @@ module.exports = function (namespace) {
   var container = t.functionExpression(null, [], t.blockStatement(body));
   var tree      = t.program([t.expressionStatement(t.callExpression(container, []))]);
 
-  body.push(t.variableDeclaration("var", [
-    t.variableDeclarator(t.identifier("self"), t.conditionalExpression(
-      t.binaryExpression("===",
-        t.unaryExpression("typeof", t.identifier("global"), true),
-        t.literal("undefined")
-      ),
-      t.identifier("window"),
-      t.identifier("global"))
-    )
-  ]));
+  body.push(util.template("self-global", true));
 
   body.push(t.variableDeclaration("var", [
     t.variableDeclarator(
diff --git a/lib/6to5/templates/self-global.js b/lib/6to5/templates/self-global.js
new file mode 100644
index 0000000000..72f256e1f7
--- /dev/null
+++ b/lib/6to5/templates/self-global.js
@@ -0,0 +1 @@
+var self = typeof global === "undefined" ? window : global;