diff --git a/package.json b/package.json
index 4db7cc3..5858f0f 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,8 @@
       [
         "babelify",
         {
-          "stage": 0
+          "stage": 0,
+          "optional": ["utility.inlineEnvironmentVariables"]
         }
       ]
     ]