After posting several fast times throughout the beginning of the 2008 indoor season, Kallur broke the 60 m hurdles indoor world record, posting a time of 7.68 at a meeting in Karlsruhe, Germany on February 10, 2008. Kallur was then the clear favourite for the World Indoor title in Valencia and won her heat in 7.87 seconds, but did not start the semi-finals, pulling out injured.