diff --git a/ppp/pppd/plugins/radius/clientid.c b/ppp/pppd/plugins/radius/clientid.c

index d49579c..91201b0 100644

--- a/ppp/pppd/plugins/radius/clientid.c

+++ b/ppp/pppd/plugins/radius/clientid.c

@@ -104,13 +104,13 @@ int rc_read_mapfile(char *filename)

 UINT4 rc_map2id(char *name)

 {

 	struct map2id_s *p;

-	char ttyname[PATH_MAX];

+	char ttyname[PATH_MAX + 1];

 	*ttyname = '\0';

 	if (*name != '/')

 		strcpy(ttyname, "/dev/");

-	strncat(ttyname, name, sizeof(ttyname));

+	strlcat(ttyname, name, sizeof(ttyname));

 	for(p = map2id_list; p; p = p->next)

 		if (!strcmp(ttyname, p->name)) return p->id;