diff --git a/def.go b/def.go
index b93b5fa..16a879f 100644
--- a/def.go
+++ b/def.go
@@ -59,6 +59,7 @@ type PacketAdminJoin struct {
 func (p *PacketAdminJoin) Bytes() []byte {
 	buf := new(bytes.Buffer)
 	enc := gob.NewEncoder(buf)
+	buf.Reset()
 
 	p.PLength = uint16(len(p.Password) + len(p.AppName) + len(p.AppVersion) + 3)
 	err := enc.Encode(p)