diff --git a/sys/net/ethernet.h b/sys/net/ethernet.h
--- a/sys/net/ethernet.h
+++ b/sys/net/ethernet.h
@@ -80,6 +80,16 @@
 	(((addr)[0] | (addr)[1] | (addr)[2] | \
 	  (addr)[3] | (addr)[4] | (addr)[5]) == 0x00)
 
+/*
+ * 802.1q-related constants.
+ */
+#define	DOT1Q_VID_NULL		0x0
+#define	DOT1Q_VID_DEF_PVID	0x1
+#define	DOT1Q_VID_DEF_SR_PVID	0x2
+#define	DOT1Q_VID_RSVD_IMPL	0xfff
+#define	DOT1Q_VID_MIN		1	/* minimum valid vlan id */
+#define	DOT1Q_VID_MAX		4095	/* maximum valid vlan id */
+
 /*
  * This is the type of the VLAN ID inside the tag, not the tag itself.
  */
diff --git a/sys/net/if_vlan_var.h b/sys/net/if_vlan_var.h
--- a/sys/net/if_vlan_var.h
+++ b/sys/net/if_vlan_var.h
@@ -126,13 +126,6 @@
 
 #define	VLAN_PCP_MAX		7
 
-#define	DOT1Q_VID_NULL		0x0
-#define	DOT1Q_VID_DEF_PVID	0x1
-#define	DOT1Q_VID_DEF_SR_PVID	0x2
-#define	DOT1Q_VID_RSVD_IMPL	0xfff
-#define	DOT1Q_VID_MIN		1	/* minimum valid vlan id */
-#define	DOT1Q_VID_MAX		4095	/* maximum valid vlan id */
-
 /*
  * 802.1q full tag. Proto and vid are stored in host byte order.
  */