diff --git a/ospf6d/ospf6_network.c b/ospf6d/ospf6_network.c
index eed7f9d..74cfbec 100644
--- a/ospf6d/ospf6_network.c
+++ b/ospf6d/ospf6_network.c
@@ -206,7 +206,7 @@
   smsghdr.msg_name = (caddr_t) &dst_sin6;
   smsghdr.msg_namelen = sizeof (struct sockaddr_in6);
   smsghdr.msg_control = (caddr_t) cmsgbuf;
-  smsghdr.msg_controllen = sizeof (cmsgbuf);
+  smsghdr.msg_controllen = scmsgp->cmsg_len;
 
   retval = sendmsg (ospf6_sock, &smsghdr, 0);
   if (retval != iov_totallen (message))