Index: head/sys/dev/usb/net/if_muge.c
===================================================================
--- head/sys/dev/usb/net/if_muge.c
+++ head/sys/dev/usb/net/if_muge.c
@@ -157,9 +157,6 @@
 #define muge_err_printf(sc, fmt, args...) \
 	device_printf((sc)->sc_ue.ue_dev, "error: " fmt, ##args)
 
-#define ETHER_IS_ZERO(addr) \
-	(!(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]))
-
 #define ETHER_IS_VALID(addr) \
 	(!ETHER_IS_MULTICAST(addr) && !ETHER_IS_ZERO(addr))
 
Index: head/sys/dev/usb/net/if_smsc.c
===================================================================
--- head/sys/dev/usb/net/if_smsc.c
+++ head/sys/dev/usb/net/if_smsc.c
@@ -171,9 +171,6 @@
 	device_printf((sc)->sc_ue.ue_dev, "error: " fmt, ##args)
 	
 
-#define ETHER_IS_ZERO(addr) \
-	(!(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]))
-	
 #define ETHER_IS_VALID(addr) \
 	(!ETHER_IS_MULTICAST(addr) && !ETHER_IS_ZERO(addr))
 	
Index: head/sys/dev/usb/net/if_ure.c
===================================================================
--- head/sys/dev/usb/net/if_ure.c
+++ head/sys/dev/usb/net/if_ure.c
@@ -68,9 +68,6 @@
     "Debug level");
 #endif
 
-#define	ETHER_IS_ZERO(addr) \
-	(!(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]))
-
 /*
  * Various supported device vendors/products.
  */
Index: head/sys/net/ethernet.h
===================================================================
--- head/sys/net/ethernet.h
+++ head/sys/net/ethernet.h
@@ -74,6 +74,9 @@
 #define	ETHER_IS_BROADCAST(addr) \
 	(((addr)[0] & (addr)[1] & (addr)[2] & \
 	  (addr)[3] & (addr)[4] & (addr)[5]) == 0xff)
+#define	ETHER_IS_ZERO(addr) \
+	(((addr)[0] | (addr)[1] | (addr)[2] | \
+	  (addr)[3] | (addr)[4] | (addr)[5]) == 0x00)
 
 /*
  * 802.1q Virtual LAN header.