diff --git a/sys/net/ethernet.h b/sys/net/ethernet.h
index 438028d1567..52d8f61b5b4 100644
--- a/sys/net/ethernet.h
+++ b/sys/net/ethernet.h
@@ -333,6 +333,7 @@ struct ether_vlan_header {
 #define	ETHERTYPE_SLOW		0x8809	/* 802.3ad link aggregation (LACP) */
 #define	ETHERTYPE_PPP		0x880B	/* PPP (obsolete by PPPoE) */
 #define	ETHERTYPE_HITACHI	0x8820	/* Hitachi Cable (Optoelectronic Systems Laboratory) */
+#define ETHERTYPE_TEST		0x8822  /* Network Conformance Testing */
 #define	ETHERTYPE_MPLS		0x8847	/* MPLS Unicast */
 #define	ETHERTYPE_MPLS_MCAST	0x8848	/* MPLS Multicast */
 #define	ETHERTYPE_AXIS		0x8856	/* Axis Communications AB proprietary bootstrap/config */