diff --git a/src/dnsmasq.h b/src/dnsmasq.h
index 1d76552..4cf12bf 100644
--- a/src/dnsmasq.h
+++ b/src/dnsmasq.h
@@ -255,7 +255,8 @@
 #define OPT_MAC_HEX        55
 #define OPT_TFTP_APREF_MAC 56
 #define OPT_RAPID_COMMIT   57
-#define OPT_LAST           58
+#define OPT_UBUS           58
+#define OPT_LAST           59
 
 /* extra flags for my_syslog, we use a couple of facilities since they are known 
    not to occupy the same bits as priorities, no matter how syslog.h is set up. */