diff --git a/lib/web/cache/cache.js b/lib/web/cache/cache.js
index 597de52bb4a..bdfa5c87bbb 100644
--- a/lib/web/cache/cache.js
+++ b/lib/web/cache/cache.js
@@ -36,6 +36,7 @@ class Cache {
       webidl.illegalConstructor()
     }
 
+    webidl.util.markAsUncloneable(this)
     this.#relevantRequestResponseList = arguments[1]
   }
 
diff --git a/lib/web/cache/cachestorage.js b/lib/web/cache/cachestorage.js
index 3e35200b626..3b1604c872d 100644
--- a/lib/web/cache/cachestorage.js
+++ b/lib/web/cache/cachestorage.js
@@ -16,6 +16,8 @@ class CacheStorage {
     if (arguments[0] !== kConstruct) {
       webidl.illegalConstructor()
     }
+
+    webidl.util.markAsUncloneable(this)
   }
 
   async match (request, options = {}) {
diff --git a/lib/web/websocket/events.js b/lib/web/websocket/events.js
index 6504149e2d2..f899c21d42b 100644
--- a/lib/web/websocket/events.js
+++ b/lib/web/websocket/events.js
@@ -145,6 +145,7 @@ class ErrorEvent extends Event {
     webidl.argumentLengthCheck(arguments, 1, prefix)
 
     super(type, eventInitDict)
+    webidl.util.markAsUncloneable(this)
 
     type = webidl.converters.DOMString(type, prefix, 'type')
     eventInitDict = webidl.converters.ErrorEventInit(eventInitDict ?? {})
diff --git a/test/node-platform-objects.js b/test/node-platform-objects.js
index 358a418496f..19e2b01a507 100644
--- a/test/node-platform-objects.js
+++ b/test/node-platform-objects.js
@@ -3,20 +3,26 @@
 const { tspl } = require('@matteo.collina/tspl')
 const { test } = require('node:test')
 const { markAsUncloneable } = require('node:worker_threads')
-const { Response, Request, FormData, Headers, MessageEvent, CloseEvent, EventSource, WebSocket } = require('..')
+const { Response, Request, FormData, Headers, ErrorEvent, MessageEvent, CloseEvent, EventSource, WebSocket } = require('..')
+const { CacheStorage } = require('../lib/web/cache/cachestorage')
+const { Cache } = require('../lib/web/cache/cache')
+const { kConstruct } = require('../lib/core/symbols')
 
-test('undici instances should be uncloneable if node exposes api', async (t) => {
+test('unserializable web instances should be uncloneable if node exposes the api', (t) => {
   if (markAsUncloneable !== undefined) {
-    t = tspl(t, { plan: 8 })
+    t = tspl(t, { plan: 11 })
     const uncloneables = [
       { Uncloneable: Response, brand: 'Response' },
       { Uncloneable: Request, value: 'http://localhost', brand: 'Request' },
       { Uncloneable: FormData, brand: 'FormData' },
-      { Uncloneable: MessageEvent, value: 'message', brand: 'MessageEvent' },
-      { Uncloneable: CloseEvent, value: 'dummy type', brand: 'CloseEvent' },
+      { Uncloneable: MessageEvent, value: 'dummy event', brand: 'MessageEvent' },
+      { Uncloneable: CloseEvent, value: 'dummy event', brand: 'CloseEvent' },
+      { Uncloneable: ErrorEvent, value: 'dummy event', brand: 'ErrorEvent' },
       { Uncloneable: EventSource, value: 'http://localhost', brand: 'EventSource' },
       { Uncloneable: Headers, brand: 'Headers' },
-      { Uncloneable: WebSocket, value: 'http://localhost', brand: 'WebSocket' }
+      { Uncloneable: WebSocket, value: 'http://localhost', brand: 'WebSocket' },
+      { Uncloneable: Cache, value: kConstruct, brand: 'Cache' },
+      { Uncloneable: CacheStorage, value: kConstruct, brand: 'CacheStorage' }
     ]
     uncloneables.forEach((platformEntity) => {
       t.throws(() => structuredClone(new platformEntity.Uncloneable(platformEntity.value)),
diff --git a/types/webidl.d.ts b/types/webidl.d.ts
index c42a2617fd2..29765c0db5b 100644
--- a/types/webidl.d.ts
+++ b/types/webidl.d.ts
@@ -82,6 +82,12 @@ interface WebidlUtil {
    * Stringifies {@param V}
    */
   Stringify (V: any): string
+
+  /**
+   * Mark a value as uncloneable for Node.js.
+   * This is only effective in some newer Node.js versions
+   */
+  markAsUncloneable (V: any): void
 }
 
 interface WebidlConverters {