diff -up libnfsidmap-0.25/libnfsidmap.c.orig libnfsidmap-0.25/libnfsidmap.c
--- libnfsidmap-0.25/libnfsidmap.c.orig	2017-11-15 10:35:56.897700293 -0500
+++ libnfsidmap-0.25/libnfsidmap.c	2017-11-15 10:38:57.655082342 -0500
@@ -128,7 +128,8 @@ static int id_as_chars(char *name, uid_t
 static int dns_txt_query(char *domain, char **nfs4domain)
 {
 	char *txtname = NFS4DNSTXTREC;
-	char *msg, *answ, *eom, *mptr; 
+	unsigned char *msg, *eom, *mptr; 
+	char *answ;
 	int len, status = -1;
 	HEADER *hdr;