diff --git a/include/n2n.h b/include/n2n.h
index 046ef49..87f87f1 100644
--- a/include/n2n.h
+++ b/include/n2n.h
@@ -31,6 +31,8 @@
     tunctl -u UID -t tunX
 */
 
+#define SN_MANUAL_MAC   /* allows supernode MAC address to be set manually */
+
 #define N2N_HAVE_DAEMON /* needs to be defined before it gets undefined */
 #define N2N_HAVE_TCP    /* needs to be defined before it gets undefined */