diff --git a/package.json b/package.json
index 45a73ed..e06afd9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "aedes-packet",
-  "version": "2.3.1",
+  "version": "2.3.2",
   "description": "Basic data structure for packets in Aedes ",
   "main": "packet.js",
   "types": "packet.d.ts",
diff --git a/packet.d.ts b/packet.d.ts
index a5f5b2d..fe521be 100644
--- a/packet.d.ts
+++ b/packet.d.ts
@@ -11,6 +11,7 @@ declare namespace aedes {
   type AedesPacket = IPacket & {
     brokerId: string
     brokerCounter: number
+    ttlInSeconds?: number
   }
 
   function Packet(object?: AedesPacket) : aedes.AedesPacket
diff --git a/packet.js b/packet.js
index 219b7ca..a53dfd0 100644
--- a/packet.js
+++ b/packet.js
@@ -9,6 +9,7 @@ function Packet (original, broker) {
   this.qos = original.qos || 0
   this.retain = original.retain || false
   this.dup = original.dup || false
+  this.ttlInSeconds = original.properties?.messageExpiryInterval
   // [MQTT-2.3.1-5]
   if (this.qos > 0 || this.cmd !== 'publish') {
     //  [MQTT-2.3.1-1]
diff --git a/test.js b/test.js
index 5899d3e..ba9eaac 100644
--- a/test.js
+++ b/test.js
@@ -13,6 +13,7 @@ test('Packet defaults - PUBLISH, QoS 0', function (t) {
   t.equal(instance.qos, 0)
   t.equal(instance.dup, false)
   t.equal(instance.retain, false)
+  t.equal(instance.ttlInSeconds, undefined)
   t.notOk(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
   t.end()
 })
@@ -29,6 +30,7 @@ test('Packet defaults - PUBREL, QoS 0', function (t) {
   t.equal(instance.retain, false)
   t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
   t.equal(instance.messageId, undefined)
+  t.equal(instance.ttlInSeconds, undefined)
   t.end()
 })
 
@@ -44,6 +46,7 @@ test('Packet defaults - PUBLISH, QoS 1', function (t) {
   t.equal(instance.retain, false)
   t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
   t.equal(instance.messageId, undefined)
+  t.equal(instance.ttlInSeconds, undefined)
   t.end()
 })
 
@@ -58,6 +61,7 @@ test('Packet defaults - PUBLISH, dup=true', function (t) {
   t.equal(instance.dup, true)
   t.equal(instance.retain, false)
   t.equal(instance.messageId, undefined)
+  t.equal(instance.ttlInSeconds, undefined)
   t.end()
 })
 
@@ -82,7 +86,43 @@ test('Packet copies over most data', function (t) {
     payload: 'world',
     qos: 2,
     dup: true,
-    retain: true
+    retain: true,
+    ttlInSeconds: undefined
+  }
+
+  t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
+  t.equal(instance.messageId, undefined)
+  delete instance.messageId
+  t.deepEqual(instance, expected)
+  t.end()
+})
+
+test('Packet understands properties.messageExpiryInterval', function (t) {
+  const original = {
+    cmd: 'publish',
+    brokerId: 'A56c',
+    brokerCounter: 42,
+    topic: 'hello',
+    payload: 'world',
+    qos: 2,
+    dup: true,
+    retain: true,
+    messageId: 24,
+    properties: {
+      messageExpiryInterval: 4
+    }
+  }
+  const instance = new Packet(original)
+  const expected = {
+    cmd: 'publish',
+    brokerId: 'A56c',
+    brokerCounter: 42,
+    topic: 'hello',
+    payload: 'world',
+    qos: 2,
+    dup: true,
+    retain: true,
+    ttlInSeconds: 4
   }
 
   t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))
@@ -114,7 +154,8 @@ test('Packet fills in broker data', function (t) {
     payload: 'world',
     qos: 2,
     dup: false,
-    retain: true
+    retain: true,
+    ttlInSeconds: undefined
   }
 
   t.ok(Object.prototype.hasOwnProperty.call(instance, 'messageId'))