  We study the Faddeev-Popov ghost sector of asymptotically safe quantum
gravity, which becomes non-perturbative in the ultraviolet. We point out that
nonzero matter-ghost couplings and higher-order ghost self-interactions exist
at a non-Gaussian fixed point for the gravitational couplings, i.e., in the
ultraviolet. Thus the ghost sector in this non-perturbative ultraviolet
completion does not keep the structure of a simple Faddeev-Popov determinant.
We discuss implications of the new ghost couplings for the Renormalization
Group flow in gravity, the form of the ultraviolet completion, and the relevant
couplings, i.e., free parameters, of the theory.
