diff --git a/packages/service-worker/src/low_level.ts b/packages/service-worker/src/low_level.ts
index f63aa3bcba..11146bb8fd 100644
--- a/packages/service-worker/src/low_level.ts
+++ b/packages/service-worker/src/low_level.ts
@@ -52,9 +52,7 @@ interface StatusEvent {
   error?: string;
 }
 
-export interface NotificationObject extends NotificationOptions {
-  title: string; 
-}
+export interface NotificationObject extends NotificationOptions { title: string; }
 
 
 function errorObservable(message: string): Observable<any> {
diff --git a/tools/public_api_guard/service-worker/service-worker.d.ts b/tools/public_api_guard/service-worker/service-worker.d.ts
index 8d5d48e50c..88b33f3f9a 100644
--- a/tools/public_api_guard/service-worker/service-worker.d.ts
+++ b/tools/public_api_guard/service-worker/service-worker.d.ts
@@ -8,7 +8,7 @@ export declare class ServiceWorkerModule {
 export declare class SwPush {
     readonly isEnabled: boolean;
     readonly messages: Observable<object>;
-    readonly messagesClicked: Observable<object>;
+    readonly messagesClicked: Observable<{ action: string; notification: NotificationObject }>;
     readonly subscription: Observable<PushSubscription | null>;
     constructor(sw: NgswCommChannel);
     requestSubscription(options: {