However, it was later determined that the first prototype metre bar was short by about 200 micrometres because of miscalculation of the flattening of the Earth, making the prototype about 0.02% shorter than the original proposed definition of the metre of one ten-millionth of the Earth's circumference. Regardless, this length became the standard. The original international prototype of the metre is still kept at the BIPM under the conditions specified in 1889.