  We consider the triple coupling of the Higgs boson in the context of the
gauge-Higgs unification scenario. We show that the triple coupling of the Higgs
boson in this scenario generically deviates from SM prediction since the Higgs
potential in this scenario has a periodicity. We calculate the coupling in the
five-dimensional $SU(3)$ x $U(1)_X$ gauge-Higgs unification model and obtain
70% deviation from the SM prediction.
