diff --git a/zebra/rt_socket.c b/zebra/rt_socket.c
index f447d8c..fa2f172 100644
--- a/zebra/rt_socket.c
+++ b/zebra/rt_socket.c
@@ -290,7 +290,7 @@
   else
     {
       masklen2ip6 (dest->prefixlen, &sin_mask.sin6_addr);
-      sin_mask.sin6_family = AF_UNSPEC;
+      sin_mask.sin6_family = AF_INET6;
 #ifdef SIN6_LEN
       sin_mask.sin6_len = sin6_masklen (sin_mask.sin6_addr);
 #endif /* SIN6_LEN */
@@ -400,7 +400,7 @@
       else
 	{
 	  masklen2ip6 (p->prefixlen, &sin_mask.sin6_addr);
-	  sin_mask.sin6_family = AF_UNSPEC;
+	  sin_mask.sin6_family = AF_INET6;
 #ifdef SIN6_LEN
 	  sin_mask.sin6_len = sin6_masklen (sin_mask.sin6_addr);
 #endif /* SIN6_LEN */