diff --git a/CHANGELOG b/CHANGELOG
index 140d11c7b..c72d36b34 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,8 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o Fixed a compilation problem on Solaris 9 caused by a missing
+  definition of IPV6_V6ONLY. Reported by Dagobert Michelsen.
+
 o Upgraded included libpcap to version 1.2.1.
 
 o [NSE] Added hostmap-robtex.nse by Arturo Busleiman, which finds other
diff --git a/ncat/util.c b/ncat/util.c
index e69cb3c96..685da2036 100644
--- a/ncat/util.c
+++ b/ncat/util.c
@@ -393,6 +393,7 @@ int do_listen(int type, int proto, const union sockaddr_u *srcaddr_u)
    http://msdn.microsoft.com/en-us/library/bb513665
 */
 #ifdef IPPROTO_IPV6
+#ifdef IPV6_V6ONLY
     if (srcaddr_u->storage.ss_family == AF_INET6) {
         int set = 1;
         /* Tell it to not try and bind to IPV4 */
@@ -400,6 +401,7 @@ int do_listen(int type, int proto, const union sockaddr_u *srcaddr_u)
             die("Unable to set IPV6 socket to bind only to IPV6");
     }
 #endif
+#endif
 
 #ifdef HAVE_SOCKADDR_SA_LEN
     sa_len = srcaddr_u->sockaddr.sa_len;