This study investigated the effect of addition of acetylated crosslinked starch as a stabilizer on set yoghurt. The presence of acetylated crosslinked starch was effective in controlling the acidity of yoghurt and improving its water holding capacity and freeze-thaw stability; however, excess acetylated crosslinked starch caused in a reduction in flavor compounds, a rough taste and a lack of refreshingness. Addition of 0.5%–1.5% acetylated crosslinked starch in set yoghurt was preferred.