diff --git a/build.json b/build.json
index ec8c31c..d89b103 100644
--- a/build.json
+++ b/build.json
@@ -17,6 +17,7 @@
   "../CustomElements/build.json",
   "src/patches-custom-elements.js",
   "src/microtask.js",
+  "src/loader.js",
   "../PointerEvents/build.json",
   "../PointerGestures/build.json",
   "../polymer-expressions/build.json",