diff --git a/tools/isobuild/isopack.js b/tools/isobuild/isopack.js
index 6306fcb2aa..1c75725253 100644
--- a/tools/isobuild/isopack.js
+++ b/tools/isobuild/isopack.js
@@ -1679,14 +1679,12 @@ _.extend(Isopack.prototype, {
         inputFileContents = inputFileContents.replace(/^.*#RemoveInProd.*$/mg, "");
       }
 
-      var babelOptions = babel.getDefaultOptions(
-        require('../tool-env/babel-features.js')
-      );
+      var babelOptions = babel.getDefaultOptions();
 
       _.extend(babelOptions, {
         filename: path,
         sourceFileName: "/" + path,
-        sourceMapName: path + ".map",
+        sourceMapTarget: path + ".map",
         sourceMap: true
       });