Getting virtual address of PE header in memory

Getting virtual address of PE header in memory

So generally, people say that all you have to do to get the PE header
address is sth. like this:
IMAGE_DOS_HEADER* IDH = (IMAGE_DOS_HEADER*)GetModuleHandle(NULL);
IMAGE_NT_HEADERS * INT = (IMAGE_NT_HEADERS *)((int *)IDH +
(int)IDH.e_lfanew);
However, after several hours of thinking why it doesn't work for me, I
realized that I additionally need to divide IDH.e_lfanew by 4. So I get
the correct pointer to IMAGE_NT_HEADER struct only in this way:
IMAGE_NT_HEADERS * INT = (IMAGE_NT_HEADERS *)((int *)IDH +
(int)(IDH.e_lfanew/4));
Could somebody explain to me why do I need to divide it? My OS is Windows
8 64 bit. Maybe my version of windows is the reason? Anyway, I would be
very grateful for any guidance!