Earlier ice-sheet mass-balance estimates disagree with satellite-altimeter-measured thickening of the catchment area that feeds the Filchner-Ronne Ice Shelf, Antarctica. In an effort to reconcile these differences, we generated a new flux-gate mass-balance estimate, using improved elevation and velocity data. Our results show a 39 ¿ 26 Gton/yr thickening, whereas earlier flux-gate results indicated minor thinning. Our results are consistent with altimeter-derived estimates of elevation change. This suggests that altimeter-observed thickening on the East Antarctic plateau may be the result of some combination of a 20th Century accumulation increase and a continuing response to the ~50% accumulation increase that began in the early Holocene.