diff --git a/lib/transport.js b/lib/transport.js
index b8ce347f2..8ecd21952 100644
--- a/lib/transport.js
+++ b/lib/transport.js
@@ -71,7 +71,11 @@ function flush (stream) {
 }
 
 function transport (fullOptions) {
-  const { pipeline, targets, levels, dedupe, options = {}, worker = {}, caller = getCallers() } = fullOptions
+  const { pipeline, targets, levels, dedupe, worker = {}, caller = getCallers() } = fullOptions
+
+  const options = {
+    ...fullOptions.options
+  }
 
   // Backwards compatibility
   const callers = typeof caller === 'string' ? [caller] : caller
diff --git a/test/transport/core.test.js b/test/transport/core.test.js
index b8af6738d..a61b0853d 100644
--- a/test/transport/core.test.js
+++ b/test/transport/core.test.js
@@ -466,6 +466,26 @@ test('sets worker data informing the transport that pino will send its config',
   instance.info('hello')
 })
 
+test('sets worker data informing the transport that pino will send its config (frozen file)', ({ match, plan, teardown }) => {
+  plan(1)
+  const config = {
+    transport: {
+      target: join(__dirname, '..', 'fixtures', 'transport-worker-data.js'),
+      options: {}
+    }
+  }
+  Object.freeze(config)
+  Object.freeze(config.transport)
+  Object.freeze(config.transport.options)
+  const instance = pino(config)
+  const transport = instance[pino.symbols.streamSym]
+  teardown(transport.end.bind(transport))
+  transport.once('workerData', (workerData) => {
+    match(workerData.workerData, { pinoWillSendConfig: true })
+  })
+  instance.info('hello')
+})
+
 test('stdout in worker', async ({ not }) => {
   let actual = ''
   const child = execa(process.argv[0], [join(__dirname, '..', 'fixtures', 'transport-main.js')])