diff --git a/lib/transport-stream.js b/lib/transport-stream.js
index bbbf38aab..9da0ff8ce 100644
--- a/lib/transport-stream.js
+++ b/lib/transport-stream.js
@@ -31,6 +31,9 @@ async function loadTransportStreamBuilder (target) {
     // See this PR for details: https://github.com/pinojs/thread-stream/pull/34
     if ((error.code === 'ENOTDIR' || error.code === 'ERR_MODULE_NOT_FOUND')) {
       fn = realRequire(target)
+    } else if (error.code === undefined) {
+      // When bundled with pkg, an undefined error is thrown when called with realImport
+      fn = realRequire(decodeURIComponent(target))
     } else {
       throw error
     }
diff --git a/test/transport/bundlers-support.test.js b/test/transport/bundlers-support.test.js
index 6fbf1777e..efe8a5edc 100644
--- a/test/transport/bundlers-support.test.js
+++ b/test/transport/bundlers-support.test.js
@@ -66,6 +66,36 @@ test('pino.transport with worker destination overridden by bundler', async ({ sa
   globalThis.__bundlerPathsOverrides = undefined
 })
 
+test('pino.transport with worker destination overridden by bundler and mjs transport', async ({ same, teardown }) => {
+  globalThis.__bundlerPathsOverrides = {
+    'pino-worker': join(__dirname, '..', '..', 'lib/worker.js')
+  }
+
+  const destination = file()
+  const transport = pino.transport({
+    targets: [
+      {
+        target: join(__dirname, '..', 'fixtures', 'ts', 'to-file-transport.es2017.cjs'),
+        options: { destination }
+      }
+    ]
+  })
+  teardown(transport.end.bind(transport))
+  const instance = pino(transport)
+  instance.info('hello')
+  await watchFileCreated(destination)
+  const result = JSON.parse(await readFile(destination))
+  delete result.time
+  same(result, {
+    pid,
+    hostname,
+    level: 30,
+    msg: 'hello'
+  })
+
+  globalThis.__bundlerPathsOverrides = undefined
+})
+
 test('pino.transport with worker-pipeline destination overridden by bundler', async ({ same, teardown }) => {
   globalThis.__bundlerPathsOverrides = {
     'pino-pipeline-worker': join(__dirname, '..', '..', 'lib/worker-pipeline.js')