sizeof(struct) returns unexpected value

This should be simple but I have no clue where to look for the issue:

I have a struct:

struct region
{
public:
    long long int x;
    long long int y;
    long long int width;
    long long int height;
    unsigned char scale;
};

When I do sizeof(region) it gives me 40 when I am expecting 33.

Any ideas?

(mingw gcc, win x64 os)