--- a/sys/bus/u4b/serial/uvscom.c
+++ b/sys/bus/u4b/serial/uvscom.c
@@ -716,7 +716,7 @@ uvscom_cfg_read_status(struct uvscom_softc *sc)
 {
 	struct usb_device_request req;
 	usb_error_t err;
-	uint8_t data[2];
+	uint8_t data[2] = {0, 0};
 
 	req.bmRequestType = UT_READ_VENDOR_DEVICE;
 	req.bRequest = UVSCOM_READ_STATUS;