diff -up ./ypxfr/ypxfr.c.ypxfr-zeroresp ./ypxfr/ypxfr.c
--- ./ypxfr/ypxfr.c.ypxfr-zeroresp	2013-04-10 16:43:21.000000000 +0200
+++ ./ypxfr/ypxfr.c	2013-05-06 18:31:36.875476520 +0200
@@ -415,6 +415,7 @@ ypxfr (char *map, char *source_host, cha
   struct hostent *h;
   int sock, result;
 
+  memset(&resp_val, '\0', sizeof(resp_val));
   /* Name of the map file */
   if (strlen (path_ypdb) + strlen (target_domain) + strlen (map) + 3 < MAXPATHLEN)
     sprintf (dbName_orig, "%s/%s/%s", path_ypdb, target_domain, map);