diff --git a/src/kits/network/dns/port_after.h b/src/kits/network/dns/port_after.h
index 760e05ad6e..9e5d3e3cab 100644
--- a/src/kits/network/dns/port_after.h
+++ b/src/kits/network/dns/port_after.h
@@ -37,7 +37,7 @@
 #undef NEED_IN6ADDR_ANY
 
 #undef NEED_GETTIMEOFDAY
-#undef HAVE_STRNDUP
+#define HAVE_STRNDUP
 #undef USE_FIONBIO_IOCTL
 #undef USE_SYSERROR_LIST
 #undef INNETGR_ARGS