diff --git a/example-sim_en.html b/example-sim_en.html
index d269c85..611b822 100644
--- a/example-sim_en.html
+++ b/example-sim_en.html
@@ -82,7 +82,6 @@
   // Preloads, with more included for phet-io brand
   let preloads = [
     '../sherpa/lib/mdn-array-from-polyfill.js',
-    '../sherpa/lib/es6-promise-1e68dc.auto.min.js',
     '../joist/js/splash.js',
     '../sherpa/lib/jquery-2.1.0.js',
     '../sherpa/lib/lodash-4.17.4.js',