diff --git a/packages/firebase/index.d.ts b/packages/firebase/index.d.ts
index 1076c273052..12318f100ad 100644
--- a/packages/firebase/index.d.ts
+++ b/packages/firebase/index.d.ts
@@ -474,6 +474,7 @@ declare namespace firebase.messaging {
     requestPermission(): Promise<any> | null;
     setBackgroundMessageHandler(callback: (a: Object) => any): any;
     useServiceWorker(registration: any): any;
+    usePublicVapidKey(b64PublicKey: string): void;
   }
 }