diff --git a/src/core/firebase.app.module.ts b/src/core/firebase.app.module.ts
index 3d03c1eb2..c1315af5e 100644
--- a/src/core/firebase.app.module.ts
+++ b/src/core/firebase.app.module.ts
@@ -1,6 +1,7 @@
 import { InjectionToken, NgZone, NgModule, Optional } from '@angular/core';
 import { app, auth, database, firestore, functions, messaging, storage } from 'firebase';
-import * as firebase from 'firebase/app';
+// @ts-ignore
+import firebase from 'firebase/app';
 
 // Public types don't expose FirebaseOptions or FirebaseAppConfig
 export type FirebaseOptions = {[key:string]: any};
@@ -37,7 +38,7 @@ export function _firebaseAppFactory(options: FirebaseOptions, nameOrConfig?: str
     config.name = config.name || name;
     const existingApp = firebase.apps.filter(app => app && app.name === config.name)[0];
     // We support FirebaseConfig, initializeApp's public type only accepts string; need to cast as any
-    return (existingApp || firebase.initializeApp(options, <any>config)) as FirebaseApp;
+    return (existingApp || firebase.initializeApp(options, config)) as FirebaseApp;
 }
 
 const FirebaseAppProvider = {
diff --git a/tools/build.js b/tools/build.js
index 466dc6548..8f4bdec79 100644
--- a/tools/build.js
+++ b/tools/build.js
@@ -301,7 +301,7 @@ function buildModules(globals) {
     switchMapTo(functions$),
     switchMapTo(storage$),
     switchMapTo(messaging$),
-    switchMapTo(dbdep$),
+    switchMapTo(dbdep$)
   );
 }