diff --git a/def.go b/def.go
index cea56c6..9da21b3 100644
--- a/def.go
+++ b/def.go
@@ -58,7 +58,7 @@ type PacketAdminJoin struct {
 
 func (p *PacketAdminJoin) Bytes() []byte {
 	buf := new(bytes.Buffer)
-	p.PLength = uint16(len(p.Password) + len(p.AppName) + len(p.AppVersion) + 3)
+	p.PLength = uint16(len(p.Password) + len(p.AppName) + len(p.AppVersion) + 6)
 
 	binary.Write(buf, binary.LittleEndian, p.PLength)
 	logInfoDebug("len : %d", buf.Len())