Merritt began the 2012 campaign by altering his approach to the first hurdle, switching from eight to seven steps. In an interview he stated, "[it] was pretty risky to make a change like that, but something had to be done if I was going to compete with (Liu Xiang of China and Dayron Robles of Cuba). The change allows me to maintain my momentum going into the first barrier." Merrit's change was highly successful for the 2012 indoor season as he became the indoor world champion in the 60 meters hurdles at the 2012 World Indoor Championships in Istanbul. In the final, he beat Liu Xiang and Pascal Martinot-Lagarde with a time of 7.44 s.