diff --git a/contrib/bind/port/freebsd/include/port_after.h b/contrib/bind/port/freebsd/include/port_after.h
index 353c6e0b80f..048d9df04d6 100644
--- a/contrib/bind/port/freebsd/include/port_after.h
+++ b/contrib/bind/port/freebsd/include/port_after.h
@@ -43,8 +43,10 @@
  * derived systems for which AF_INET6 is defined.
  */
 #ifndef AF_INET6
-#define AF_INET6	24
-#else
+#define AF_INET6	28
+#endif
+
+#ifdef SIN6_LEN
 #define HAS_INET6_STRUCTS
 #define HAVE_SA_LEN
 #endif