  Using the quasilocal properties alone we show that the area spectrum of a
black hole horizon must be discrete, independent of any specific quantum theory
of gravity. The area spectrum is found to be half-integer spaced with values
$8\pi \gamma \ell_{p}^{2}j$ where $j\in \mathbb{N}/2$. We argue that if
microstate counting is carried out for quantum states residing on the horizon
only, correction of $\exp(-\mathcal{A}/4\ell_{p}^{2})$ over the
Bekenstein-Hawking area law must arise in black hole entropy.
