}
/* Estimates the interaction volume^2 for non-local interactions */
-static real nonlocal_vol2(const struct gmx_domdec_zones_t *zones, rvec ls, real r)
+static real nonlocal_vol2(const struct gmx_domdec_zones_t *zones, const rvec ls, real r)
{
real cl, ca, za;
real vold_est;