diff --git a/monitor.c b/monitor.c
index f142a879f4..bec9211b21 100644
--- a/monitor.c
+++ b/monitor.c
@@ -434,8 +434,7 @@ static void do_change_vnc(const char *target)
     if (strcmp(target, "passwd") == 0 ||
 	strcmp(target, "password") == 0) {
 	char password[9];
-	monitor_readline("Password: ", 1, password, sizeof(password)-1);
-	password[sizeof(password)-1] = '\0';
+	monitor_readline("Password: ", 1, password, sizeof(password));
 	if (vnc_display_password(NULL, password) < 0)
 	    term_printf("could not set VNC server password\n");
     } else {