Disable Unreal Headers completely for one file

Hey guys,
I wrote a small library using only Windows.h and stdlib in It’s own small project…
now I want include all of it into my unreal project…
I don’t care about linux or something else right now, so I ignore cross platform compability for now…
the problem now is that It still causes many issues when these files compile…
just in unreal engine though, standalone they work just as excpected…
I dont want to compile them into a own static library cause for this the lib is just to small and i probably will change many things in there…
now my question is, is there a way to completely disable unreals influnce in those files?