diff --git a/index.d.ts b/index.d.ts
index 93d474e..2267a33 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -23,6 +23,7 @@ export {
   // mqtt-packet
   QoS,
   PacketCmd,
+  UserProperties,
   IPacket,
   IConnectPacket,
   IPublishPacket,