diff --git a/def.go b/def.go
index 951ddec..037a800 100644
--- a/def.go
+++ b/def.go
@@ -60,8 +60,8 @@ func (p *PacketAdminJoin) Bytes() []byte {
 	buf := new(bytes.Buffer)
 	p.PLength = uint16(len(p.Password) + len(p.AppName) + len(p.AppVersion) + 3)
 
-	buf.WriteByte(p.PLength)
-	buf.WriteByte(p.PType)
+	binary.Write(buf, binary.LittleEndian, p.PLength)
+	binary.Write(buf, binary.LittleEndian, p.PType)
 	buf.WriteString(p.Password)
 	buf.WriteString(p.AppName)
 	buf.WriteString(p.AppVersion)