#define USB_CFG_DESCR_PROPS_STRING_0 0
#define USB_CFG_DESCR_PROPS_STRING_VENDOR 0
#define USB_CFG_DESCR_PROPS_STRING_PRODUCT 0
-#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER 0
+#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER (USB_PROP_IS_DYNAMIC | USB_PROP_IS_RAM)
#define USB_CFG_DESCR_PROPS_HID 0
#define USB_CFG_DESCR_PROPS_HID_REPORT 0
#define USB_CFG_DESCR_PROPS_UNKNOWN 0