  Here we report the X-ray spectral analysis of 5 high-redshift ($z \geq 2$)
radio-quiet quasars (RQQs) observed with the ASCA satellite. A simple power law
with Galactic absorption model well fits the data. There is no evidence of a
reflection component. The average spectral slope in the observed 0.5--10 keV
energy range, $< \Gamma > = 1.68\pm{0.09}$ (dispersion $\sigma \sim 0.11$),
places the high-z objects of the present sample in the lower-\Gamma tail of the
RQQs spectral indices distribution.
