  We performed time-series photometry of the PG1159-type star HE 1429-1209,
which was recently discovered in the ESO SPY survey. We show that the star is a
low-amplitude (about 0.05 mag) non-radial g-mode pulsator with a period of
919s. HE 1429-1209 is among the hottest known post-AGB stars (Teff=160000 K)
and, together with the known pulsator RX J2117.1+3412, it defines empirically
the blue edge of the GW Vir instability strip in the HRD at high luminosities.
