I'm coding in C and using GDI. When trying to use RGBQUAD, this errors happens:

C2371: 'RGBQUAD': redefinition; different basic types

Here's my code (it's a header):

typedef union
{
    COLORREF rgb;
    struct
    {
        BYTE b;
        BYTE g;
        BYTE r;
        BYTE unused;
    };
} RGBQUAD, * PRGBQUAD;