In the last two decades, high-frequency trading (HFT) has become a common financial market practice. Its impacts on market efficiency, liquidity and volatility are investigated and discussed across the globe. While this research is mostly concentrated on equity markets, aspects related to futures market are also of interest. In this paper, we study the effects of high-frequency trading (HFT) on price volatility in Borsa Istanbul index futures market. More specifically, departing from tick-by-tick order and transaction data of futures contracts, we measure the share of HFT within all the transactions and order flows. We examine the interaction between low-latency trading and volatility across the entire sample as well as for the subsamples where volatility is already high and low. Preliminary results show that HFT increases volatility on trading days with negative returns in stable market conditions. However, no similar impact is found in times of increased market stress and extreme volatility.