diff --git a/ospf6d/ospf6_network.c b/ospf6d/ospf6_network.c
index 7b1cf91932..5e254661f1 100644
--- a/ospf6d/ospf6_network.c
+++ b/ospf6d/ospf6_network.c
@@ -198,14 +198,18 @@ ospf6_sendmsg (struct in6_addr *src, struct in6_addr *dst,
   int retval;
   struct msghdr smsghdr;
   struct cmsghdr *scmsgp;
-  u_char cmsgbuf[CMSG_SPACE(sizeof (struct in6_pktinfo))];
+  union
+  {
+    struct cmsghdr hdr;
+    u_char buf[CMSG_SPACE (sizeof (struct in6_pktinfo))];
+  } cmsgbuf;
   struct in6_pktinfo *pktinfo;
   struct sockaddr_in6 dst_sin6;
 
   assert (dst);
   assert (*ifindex);
 
-  scmsgp = (struct cmsghdr *)cmsgbuf;
+  scmsgp = (struct cmsghdr *)&cmsgbuf;
   pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp));
   memset (&dst_sin6, 0, sizeof (struct sockaddr_in6));
 
@@ -222,7 +226,7 @@ ospf6_sendmsg (struct in6_addr *src, struct in6_addr *dst,
   dst_sin6.sin6_len = sizeof (struct sockaddr_in6);
 #endif /*SIN6_LEN*/
   memcpy (&dst_sin6.sin6_addr, dst, sizeof (struct in6_addr));
-#ifdef HAVE_SIN6_SCOPE_ID
+#ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
   dst_sin6.sin6_scope_id = *ifindex;
 #endif
 
@@ -238,8 +242,8 @@ ospf6_sendmsg (struct in6_addr *src, struct in6_addr *dst,
   smsghdr.msg_iovlen = iov_count (message);
   smsghdr.msg_name = (caddr_t) &dst_sin6;
   smsghdr.msg_namelen = sizeof (struct sockaddr_in6);
-  smsghdr.msg_control = (caddr_t) cmsgbuf;
-  smsghdr.msg_controllen = scmsgp->cmsg_len;
+  smsghdr.msg_control = (caddr_t) &cmsgbuf.buf;
+  smsghdr.msg_controllen = sizeof(cmsgbuf.buf);
 
   retval = sendmsg (ospf6_sock, &smsghdr, 0);
   if (retval != iov_totallen (message))