diff --git a/lib/UiModule.js b/lib/UiModule.js
index 865f5499..0acfacb0 100644
--- a/lib/UiModule.js
+++ b/lib/UiModule.js
@@ -1,6 +1,6 @@
 import { AbstractModule, Hook } from 'adapt-authoring-core'
 import path from 'path'
-import UiBuild from './UiBuild.js'
+
 /**
  * The main entry-point for the Adapt authoring tool web-app/front-end
  * @memberof ui
@@ -75,6 +75,7 @@ class UiModule extends AbstractModule {
    * @return {Promise}
    */
   async build () {
+    const { default: UiBuild } = await import('./UiBuild.js')
     const build = new UiBuild({
       app: this.app,
       log: this.log.bind(this),