diff --git a/postcss.config.js b/postcss.config.js
index e267960..db3ec88 100644
--- a/postcss.config.js
+++ b/postcss.config.js
@@ -4,7 +4,7 @@ module.exports = {
     ...(process.env.NODE_ENV === "production"
       ? [
           require("@fullhuman/postcss-purgecss")({
-            content: ["./.11ty-vite/**/*.html"],
+            content: ["./.11ty-vite/**/*.html", "./.11ty-vite/**/*.js"],
             safelist: ["usa-js-loading"],
             extractors: [
               {
diff --git a/src/js/index.js b/src/js/index.js
index 6dbdc11..c274d1b 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -1,5 +1,12 @@
 import "@uswds/uswds/css/uswds.min.css"
 import { accordion, banner, navigation } from "@uswds/uswds/js"
+
+// This is part of the "uswds-init" machinery to handle failure to load JS
+// gracefully. Normally uswds-core/src/js/start.js would do this for us, but
+// this file only gets included in bundles - there's no way to individually
+// include it.
+window.uswdsPresent = true
+
 accordion.on()
 banner.on()
 navigation.on()