diff --git a/lib/internal/worker/io.js b/lib/internal/worker/io.js
index 95c5515d14..9ec95509b5 100644
--- a/lib/internal/worker/io.js
+++ b/lib/internal/worker/io.js
@@ -107,6 +107,10 @@ function validateMessagePort(port, name) {
     throw new ERR_INVALID_ARG_TYPE(name, 'MessagePort', port);
 }
 
+function isMessageEvent(value) {
+  return value != null && kData in value;
+}
+
 class MessageEvent extends Event {
   constructor(type, {
     data = null,
@@ -131,19 +135,49 @@ class MessageEvent extends Event {
 
 ObjectDefineProperties(MessageEvent.prototype, {
   data: {
-    get() { return this[kData]; }, enumerable: true, configurable: true
+    get() {
+      if (!isMessageEvent(this))
+        throw new ERR_INVALID_THIS('MessageEvent');
+      return this[kData];
+    },
+    enumerable: true,
+    configurable: true,
   },
   origin: {
-    get() { return this[kOrigin]; }, enumerable: true, configurable: true
+    get() {
+      if (!isMessageEvent(this))
+        throw new ERR_INVALID_THIS('MessageEvent');
+      return this[kOrigin];
+    },
+    enumerable: true,
+    configurable: true,
   },
   lastEventId: {
-    get() { return this[kLastEventId]; }, enumerable: true, configurable: true
+    get() {
+      if (!isMessageEvent(this))
+        throw new ERR_INVALID_THIS('MessageEvent');
+      return this[kLastEventId];
+    },
+    enumerable: true,
+    configurable: true,
   },
   source: {
-    get() { return this[kSource]; }, enumerable: true, configurable: true
+    get() {
+      if (!isMessageEvent(this))
+        throw new ERR_INVALID_THIS('MessageEvent');
+      return this[kSource];
+    },
+    enumerable: true,
+    configurable: true,
   },
   ports: {
-    get() { return this[kPorts]; }, enumerable: true, configurable: true
+    get() {
+      if (!isMessageEvent(this))
+        throw new ERR_INVALID_THIS('MessageEvent');
+      return this[kPorts];
+    },
+    enumerable: true,
+    configurable: true,
   },
 });
 
diff --git a/test/parallel/test-messageevent-brandcheck.js b/test/parallel/test-messageevent-brandcheck.js
new file mode 100644
index 0000000000..2174b3f7bb
--- /dev/null
+++ b/test/parallel/test-messageevent-brandcheck.js
@@ -0,0 +1,21 @@
+// Flags: --expose-internals
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+const {
+  MessageEvent,
+} = require('internal/worker/io');
+
+[
+  'data',
+  'origin',
+  'lastEventId',
+  'source',
+  'ports',
+].forEach((i) => {
+  assert.throws(() => Reflect.get(MessageEvent.prototype, i, {}), {
+    code: 'ERR_INVALID_THIS',
+  });
+});