关于ADO

我在VC开发中，使用ADO,但每次编译老是出此警告：你们遇到过吗？
msado15.tlh(405) : warning C4146: unary minus operator applied to unsigned type, result still unsigned第405行是：***表示的行
enum RecordCreateOptionsEnum
{
    adCreateCollection = 8192,
    adCreateStructDoc = -2147483648,***
    adCreateNonCollection = 0,
    adOpenIfExists = 33554432,
    adCreateOverwrite = 67108864,
    adFailIfNotExists = -1
};