diff --git a/trace/udp.go b/trace/udp.go
index 50f5622..94bc1c9 100644
--- a/trace/udp.go
+++ b/trace/udp.go
@@ -167,6 +167,7 @@ func (t *UDPTracer) send(ttl int) error {
 	}
 
 	srcIP, srcPort, udpConn := t.getUDPConn(0)
+	defer udpConn.Close()
 
 	var payload []byte
 	if t.Quic {