diff --git a/packages/platform-webworker/src/platform-webworker.ts b/packages/platform-webworker/src/platform-webworker.ts
index 8ecc2a4b57340..37552b455a7f4 100644
--- a/packages/platform-webworker/src/platform-webworker.ts
+++ b/packages/platform-webworker/src/platform-webworker.ts
@@ -13,7 +13,7 @@ import {WORKER_SCRIPT, platformWorkerUi} from './worker_render';
 export {VERSION} from './version';
 export {ClientMessageBroker, ClientMessageBrokerFactory, FnArg, UiArguments} from './web_workers/shared/client_message_broker';
 export {MessageBus, MessageBusSink, MessageBusSource} from './web_workers/shared/message_bus';
-export {PRIMITIVE, SerializerTypes} from './web_workers/shared/serializer';
+export {SerializerTypes} from './web_workers/shared/serializer';
 export {ReceivedMessage, ServiceMessageBroker, ServiceMessageBrokerFactory} from './web_workers/shared/service_message_broker';
 export {WORKER_UI_LOCATION_PROVIDERS} from './web_workers/ui/location_providers';
 export {WORKER_APP_LOCATION_PROVIDERS} from './web_workers/worker/location_providers';
diff --git a/packages/platform-webworker/src/web_workers/shared/serializer.ts b/packages/platform-webworker/src/web_workers/shared/serializer.ts
index 02eede18da847..3ed371d0478ac 100644
--- a/packages/platform-webworker/src/web_workers/shared/serializer.ts
+++ b/packages/platform-webworker/src/web_workers/shared/serializer.ts
@@ -22,14 +22,6 @@ export const enum SerializerTypes {
   RENDER_STORE_OBJECT,
 }
 
-/**
- * Any type that does not need to be serialized (string, number, boolean)
- *
- * @experimental WebWorker support in Angular is currently experimental.
- * @deprecated in v4. Use SerializerTypes.PRIMITIVE instead
- */
-export const PRIMITIVE = SerializerTypes.PRIMITIVE;
-
 export class LocationType {
   constructor(
       public href: string, public protocol: string, public host: string, public hostname: string,
diff --git a/tools/public_api_guard/platform-webworker/platform-webworker.d.ts b/tools/public_api_guard/platform-webworker/platform-webworker.d.ts
index 47f56568c5b39..68743d546134a 100644
--- a/tools/public_api_guard/platform-webworker/platform-webworker.d.ts
+++ b/tools/public_api_guard/platform-webworker/platform-webworker.d.ts
@@ -46,9 +46,6 @@ export declare const platformWorkerApp: (extraProviders?: StaticProvider[] | und
 /** @experimental */
 export declare const platformWorkerUi: (extraProviders?: StaticProvider[] | undefined) => PlatformRef;
 
-/** @experimental */
-export declare const PRIMITIVE: SerializerTypes;
-
 /** @experimental */
 export interface ReceivedMessage {
     args: any[];