diff --git a/ui/t.c b/ui/t.c
index c2d82be..724e6c7 100644
--- a/ui/t.c
+++ b/ui/t.c
@@ -33,7 +33,7 @@ char		*device = "/dev/ttyS0";
 int		K = 0;
 // char		ligne[100];
 
-while ((opt = getopt(argc, argv, "d:hv")) != -1) {
+while ((opt = getopt(argc, argv, "d:hKv")) != -1) {
 	switch (opt) {
 		case 'd':	device = optarg;	break;
 		case 'h':	help(0);		break;