  We present an attempt to constrain deviations from the gravitational
inverse-square law on large-scale structure scales. A perturbed law modifies
the Poisson equation, which implies a scale-dependent growth of overdensities
in the linear regime and thus modifies the power spectrum shape. We use two
large-scale structure surveys (the Sloan Digital Sky survey and the
Anglo-Australian Two-degree field galaxy redshift survey) to constrain the
parameters of two simple modifications of the inverse-square law. We find no
evidence for deviations from normal gravity on the scales probed by these
surveys (~ 10^(23) m.)
