diff --git a/lib/ChangeLog b/lib/ChangeLog
index 57bb3d1..ee20de8 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,8 @@
+2004-04-05 Hasso Tepper <hasso at quagga.net>
+
+	* lib/prefix.[hc]: inet6_ntoa utility function copied from
+	  ripngd/ripngd.c (inet6_ntop).
+
 2004-04-05 Paul Jakma <paul@dishone.st>
 
 	* vty.c: Improve logging of failures to open vty socket(s).
diff --git a/lib/prefix.c b/lib/prefix.c
index 8207544..56539fc 100644
--- a/lib/prefix.c
+++ b/lib/prefix.c
@@ -735,3 +735,14 @@
   return 1;
 }
 
+#ifdef HAVE_IPV6
+/* Utility function for making IPv6 address string. */
+const char *
+inet6_ntoa (struct in6_addr *addr)
+{
+  static char buf[INET6_ADDRSTRLEN];
+
+  inet_ntop (AF_INET6, addr, buf, INET6_ADDRSTRLEN);
+  return buf;
+}
+#endif /* HAVE_IPV6 */
diff --git a/lib/prefix.h b/lib/prefix.h
index 0546095..7ef5347 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -173,6 +173,8 @@
 void masklen2ip6 (int, struct in6_addr *);
 
 void str2in6_addr (const char *, struct in6_addr *);
+const char *inet6_ntoa (struct in6_addr *);
+
 #endif /* HAVE_IPV6 */
 
 int all_digit (const char *);