diff --git a/icmp.c b/icmp.c
index d612d9b..54690eb 100644
--- a/icmp.c
+++ b/icmp.c
@@ -141,7 +141,7 @@ void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip)
 	p_nra->nd_ra_cksum = 0;		// Checksum
 	p_nra->nd_ra_curhoplimit = 64;		// Hop count
 	p_nra->nd_ra_flags_reserved = (ND_RA_FLAG_MANAGED|ND_RA_FLAG_OTHER); // Flags
-	p_nra->nd_ra_router_lifetime = AdvDefaultLifetime;	// Lifetime
+	p_nra->nd_ra_router_lifetime = htons(AdvDefaultLifetime);	// Lifetime
 	p_nra->nd_ra_reachable = 0;	// Reachable time
 	p_nra->nd_ra_retransmit = 0;	// Retrans timer
 	// Option PI after RA message (rfc4861)