diff --git a/ip/ipmptcp.c b/ip/ipmptcp.c
index aaacc0a5..01f6906f 100644
--- a/ip/ipmptcp.c
+++ b/ip/ipmptcp.c
@@ -477,6 +477,7 @@ static int mptcp_monitor_msg(struct rtnl_ctrl_data *ctrl,
 	const struct genlmsghdr *ghdr = NLMSG_DATA(n);
 	struct rtattr *tb[MPTCP_ATTR_MAX + 1];
 	int len = n->nlmsg_len;
+	__u16 flags = 0;
 
 	len -= NLMSG_LENGTH(GENL_HDRLEN);
 	if (len < 0)
@@ -526,8 +527,6 @@ static int mptcp_monitor_msg(struct rtnl_ctrl_data *ctrl,
 		printf(" backup=%u", rta_getattr_u8(tb[MPTCP_ATTR_BACKUP]));
 	if (tb[MPTCP_ATTR_ERROR])
 		printf(" error=%u", rta_getattr_u8(tb[MPTCP_ATTR_ERROR]));
-	if (tb[MPTCP_ATTR_FLAGS])
-		printf(" flags=%x", rta_getattr_u16(tb[MPTCP_ATTR_FLAGS]));
 	if (tb[MPTCP_ATTR_TIMEOUT])
 		printf(" timeout=%u", rta_getattr_u32(tb[MPTCP_ATTR_TIMEOUT]));
 	if (tb[MPTCP_ATTR_IF_IDX])
@@ -539,6 +538,15 @@ static int mptcp_monitor_msg(struct rtnl_ctrl_data *ctrl,
 	if (tb[MPTCP_ATTR_SERVER_SIDE] && rta_getattr_u8(tb[MPTCP_ATTR_SERVER_SIDE]))
 		printf(" server_side");
 
+	if (tb[MPTCP_ATTR_FLAGS])
+		flags = rta_getattr_u16(tb[MPTCP_ATTR_FLAGS]);
+	if (flags & MPTCP_PM_EV_FLAG_DENY_JOIN_ID0) {
+		flags &= ~MPTCP_PM_EV_FLAG_DENY_JOIN_ID0;
+		printf(" deny_join_id0");
+	}
+	if (flags) /* remaining bits */
+		printf(" flags=0x%x", flags);
+
 	puts("");
 out:
 	fflush(stdout);