  We construct asymptotically flat black hole solutions of Einstein-scalar
gravity sourced by a nontrivial scalar field with 1/r asymptotic behaviour.
Near the singularity the black hole behaves as the Janis-Newmann-Winicour-Wyman
solution. The hairy black hole solutions allow for a consistent thermodynamical
description. At large mass they have the same thermodynamical behaviour of the
Schwarzschild black hole, whereas for small masses they differ substantially
from the latter.
