Cannot assign a value to 64-bit integer on 32-bit platform?

You need to make the integer constant of the right type. The problem is that 0x100000000 is interpreted as an int and casting / assignment doesn't help: the constant itself is too big for an int . You need to be able to specify that the constant is of uint64_t type.

What you've written is perfectly valid C99 (assuming you've #included )¹. So it looks like you've invoked your compiler in C89 mode rather than C99 mode. In C89, there is no guarantee that a 64-bit type is available, but it's a common extension.

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