diff --git a/lib/err.js b/lib/err.js
index ccd81c9..d92fce4 100644
--- a/lib/err.js
+++ b/lib/err.js
@@ -28,6 +28,11 @@ const pinoErrProto = Object.create({}, {
     writable: true,
     value: undefined
   },
+  cause: {
+    enumerable: true,
+    writable: true,
+    value: undefined
+  },
   raw: {
     enumerable: false,
     get: function () {
@@ -60,6 +65,10 @@ function errSerializer (err) {
     _err.aggregateErrors = err.errors.map(err => errSerializer(err))
   }
 
+  if (err.cause) {
+    _err.cause = errSerializer(err.cause)
+  }
+
   for (const key in err) {
     if (_err[key] === undefined) {
       const val = err[key]
diff --git a/test/err.test.js b/test/err.test.js
index 746ed7a..d073c06 100644
--- a/test/err.test.js
+++ b/test/err.test.js
@@ -194,3 +194,27 @@ test('serializes aggregate errors', { skip: !global.AggregateError }, function (
   t.match(serialized.aggregateErrors[1].stack, /^Error: bar/)
   t.match(serialized.stack, /err\.test\.js:/)
 })
+
+test('serializes causes', function (t) {
+  t.plan(11)
+
+  const bar = new Error('bar')
+  bar.cause = new Error('foo')
+  bar.cause.cause = new Error('baz')
+
+  const serialized = serializer(bar)
+
+  t.equal(serialized.type, 'Error')
+  t.equal(serialized.message, 'bar: foo: baz') // message serialization already walks cause-chain
+  t.match(serialized.stack, /err\.test\.js:/)
+
+  t.ok(serialized.cause)
+  t.equal(serialized.cause.type, 'Error')
+  t.equal(serialized.cause.message, 'foo: baz')
+  t.match(serialized.cause.stack, /err\.test\.js:/)
+
+  t.ok(serialized.cause.cause)
+  t.equal(serialized.cause.cause.type, 'Error')
+  t.equal(serialized.cause.cause.message, 'baz')
+  t.match(serialized.cause.cause.stack, /err\.test\.js:/)
+})