diff --git a/host/lux_host.go b/host/lux_host.go
index 1b644eb..e1ef602 100644
--- a/host/lux_host.go
+++ b/host/lux_host.go
@@ -59,7 +59,7 @@ func (host *LuxHost) Heartbeat() error {
 
 	packet := net.LuxPacket{
 		Target: host.router.GetThisKey().Id,
-		Type:   0x6969, // FIXME
+		Type:   net.LuxPacketTypeHeartbeat,
 		Buffer: proto.NewLuxBuffer(),
 	}
 
diff --git a/net/lux_packet.go b/net/lux_packet.go
index a5b7389..edfdecb 100644
--- a/net/lux_packet.go
+++ b/net/lux_packet.go
@@ -11,6 +11,13 @@ import (
 	"net"
 )
 
+type LuxPacketType uint
+
+const (
+	LuxPacketTypeHeartbeat = 0
+	LuxPacketTypeSync      = 1
+)
+
 const LUX_PROTO_PACKET_HDRLEN = proto.LUX_PROTO_ID_SIZE + 2
 
 // Target, Type are decoded from header
@@ -22,7 +29,7 @@ const LUX_PROTO_PACKET_HDRLEN = proto.LUX_PROTO_ID_SIZE + 2
 // associated key with route.
 type LuxPacket struct {
 	Target      proto.LuxID
-	Type        uint
+	Type        LuxPacketType
 	Buffer      proto.LuxBuffer
 	ChannelType LuxChannelType
 }
@@ -51,7 +58,7 @@ func DecryptLuxPacket(dgram LuxDatagram, key crypto.LuxKey) (LuxPacket, error) {
 	}
 
 	if pType, err := packet.Buffer.ReadUint16(); err == nil {
-		packet.Type = uint(pType)
+		packet.Type = LuxPacketType(pType)
 	} else {
 		return packet, err
 	}