typo in "Kapusta" or "Ashok Das"? Formula for thermal propagator

Sunset

Hi! Does somebody of you have Kapusta's book "finite temperature field theory" and Ashok Das book (same title)?
I'm quite sure there is a typo in one of them - compare the formulas for the fourier transformed thermal propagator:
Kapusta (3.22) and Ashok (1.30)
All the letters are the same but there is a missing minus-sign in front of the omega in Ashok's formula. Does somebody know where it comes from or which formula is the correct one?

Best regards