diff --git a/src/device/serial_passthrough.c b/src/device/serial_passthrough.c
index 6025f264a..b5026f9b6 100644
--- a/src/device/serial_passthrough.c
+++ b/src/device/serial_passthrough.c
@@ -62,12 +62,6 @@ serial_passthrough_init(void)
     }
 }
 
-static void
-serial_passthrough_timers_off(serial_passthrough_t *dev)
-{
-    timer_stop(&dev->host_to_serial_timer);
-}
-
 static void
 serial_passthrough_write(serial_t *s, void *priv, uint8_t val)
 {
@@ -182,7 +176,7 @@ serial_passthrough_dev_init(const device_t *info)
     dev->serial = serial_attach_ex(dev->port, serial_passthrough_rcr_cb,
                                    serial_passthrough_write, serial_passthrough_transmit_period, serial_passthrough_lcr_callback, dev);
 
-    strncpy(dev->host_serial_path, device_get_config_string("host_serial_path"), 1024);
+    strncpy(dev->host_serial_path, device_get_config_string("host_serial_path"), 1023);
 
     serial_passthrough_log("%s: port=COM%d\n", info->name, dev->port + 1);
     serial_passthrough_log("%s: baud=%f\n", info->name, dev->baudrate);