- SignatureDescriptor.Header.Size = USB_Device_GetSerialString(SignatureDescriptor.UnicodeString,
- sizeof(SignatureDescriptor.UnicodeString));
+ SignatureDescriptor.Header.Size = USB_STRING_LEN(USB_Device_GetSerialString(SignatureDescriptor.UnicodeString,
+ sizeof(SignatureDescriptor.UnicodeString) / sizeof(SignatureDescriptor.UnicodeString[0])));