diff --git a/a8/udplistener.cc b/a8/udplistener.cc
index 7d5252a..cf9e9e3 100644
--- a/a8/udplistener.cc
+++ b/a8/udplistener.cc
@@ -152,9 +152,4 @@ namespace a8
 
     }
 
-    void UdpListener::OnRecvUdpPacket(UdpPacket* pkt)
-    {
-
-    }
-
 }
diff --git a/a8/udplistener.h b/a8/udplistener.h
index 5f3ec28..235779b 100644
--- a/a8/udplistener.h
+++ b/a8/udplistener.h
@@ -1,5 +1,10 @@
 #pragma once
 
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <sys/epoll.h>
+#include <netinet/tcp.h>
+
 namespace a8
 {
     struct UdpPacket
@@ -14,6 +19,7 @@ namespace a8
     {
     public:
         std::function<void (a8::UdpListener*, int error_id)> on_error;
+        std::function<void (a8::UdpListener*, UdpPacket*)> on_recv_packet;
         std::string bind_address;
         unsigned short bind_port = 0;
 
@@ -25,7 +31,6 @@ namespace a8
         void Close();
         bool IsActive();
         virtual void SendUdpPacket(UdpPacket* pkt);
-        virtual void OnRecvUdpPacket(UdpPacket* pkt);
 
     private:
         a8::UdpListenerImpl* impl_ = nullptr;