diff --git a/lib/zebra.h b/lib/zebra.h
index cb83a11..70d498a 100644
--- a/lib/zebra.h
+++ b/lib/zebra.h
@@ -493,7 +493,8 @@
 typedef enum {
   AFI_IP  = 1,
   AFI_IP6 = 2,
-#define AFI_MAX 3
+  AFI_ETHER = 3,                /* RFC 1700 has "6" for 802.* */
+#define AFI_MAX 4
 } afi_t;
 
 /* Subsequent Address Family Identifier. */