diff --git a/usb/device/USBSerial/USBCDC.h b/usb/device/USBSerial/USBCDC.h
index fd00f227c7..bc281550e4 100644
--- a/usb/device/USBSerial/USBCDC.h
+++ b/usb/device/USBSerial/USBCDC.h
@@ -41,7 +41,7 @@ public:
     * @param product_id Your product_id
     * @param product_release Your product_release
     */
-    USBCDC(bool connect_blocking, uint16_t vendor_id, uint16_t product_id, uint16_t product_release);
+    USBCDC(bool connect_blocking=true, uint16_t vendor_id=0x1f00, uint16_t product_id=0x2012, uint16_t product_release=0x0001);
 
     /**
     * Fully featured constructor