fmod function from math.h library in C not working correctly?

Ok, so hopefully I do not look like an idiot from asking this question…as it is quite basic, but my brain is either on vacation or something is indeed wrong.

So -4 % 5 or -4 mod 5 should equal 1 correct? Why is it that the fmod function from the math.h library returns -4 when you use it, i.e fmod(-4, 5) returns -4 instead of 1. I’m using the gcc compiler via cygqin if that is any help as well.

Thanks!

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