diff --git a/bin/sdb_tools/zone2ldap.c b/bin/sdb_tools/zone2ldap.c

index d56bc56..99c3314 100644

--- a/bin/sdb_tools/zone2ldap.c

+++ b/bin/sdb_tools/zone2ldap.c

@@ -817,11 +817,11 @@ build_dn_from_dc_list (char **dc_list, unsigned int ttl, int flag, char *zone)

     }

-      strlcat (dn, tmp, sizeof (dn));

+      strncat (dn, tmp, sizeof (dn) - strlen (dn));

     }

   sprintf (tmp, "dc=%s", dc_list[0]);

-  strlcat (dn, tmp, sizeof (dn));

+  strncat (dn, tmp, sizeof (dn) - strlen (dn));

 	    fflush(NULL);

   return dn;