diff --git a/libmctp.h b/libmctp.h
index 523891f..b36a943 100644
--- a/libmctp.h
+++ b/libmctp.h
@@ -97,6 +97,7 @@
 	struct mctp	*mctp;
 	int		pkt_size;
 	int		pkt_pad;
+	int		(*start)(struct mctp_binding *binding);
 	int		(*tx)(struct mctp_binding *binding,
 				struct mctp_pktbuf *pkt);
 };