Determine 32bit/64bit from powershell script inside Inno Setup

Consider the following powershell script:

[System.IntPtr]::Size
[Environment]::Is64BitProcess

If I run this directly inside powershell on a 64bit machine, then I correctly get

8
True

But when I wrap this inside a self-extracting installer using Inno Setup (that is built on a 32bit machine) I always get:

4
False

How do I make sure powershell is running in 64bit mode when on a 64bit computer (and 32bit for 32bit computer)?

I have also tried executing a batch file which calls the powershell script, assuming that the system would start powershell in its default mode, but this also doesn't work.

I have also tried iexpress to wrap the program, same problem.

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