diff --git a/angular/src/app-initialize.ts b/angular/src/app-initialize.ts
index 1bfbc2cd23..99935c151a 100644
--- a/angular/src/app-initialize.ts
+++ b/angular/src/app-initialize.ts
@@ -8,7 +8,7 @@ import { IonicWindow } from './types/interfaces';
 import '@ionic/core/dist/ionic/svg';
 
 export function appInitialize(config: Config) {
-  return () => {
+  return (): any => {
     const win: IonicWindow = window as any;
     if (typeof win !== 'undefined') {
       const Ionic = win.Ionic = win.Ionic || {};
@@ -31,7 +31,7 @@ export function appInitialize(config: Config) {
           elm.removeEventListener(eventName, cb, opts);
         }
       };
-      defineCustomElements(win, {
+      return defineCustomElements(win, {
         exclude: ['ion-tabs', 'ion-tab']
       });
     }