Every student has different learning styles. They have tendency in perceiving, interacting and processing information they have learned. Those tendencies can be identified by assessing stodente' learning styles using the Index of Learning Style (ILS). ILS is commonly used to identify engineering student's learning style in learning personalization system. However, this questionnaire is developed in English language. Moreover, this study aims to give contribution in translating the questionnaire to Indonesian version. Hence, students who have Indonesian language as their mother tongue could easily understood the questionnaire. This study also describes the validity and the reliability score of the ILS adaptation to Indonesian version. There are four statements in Indonesian version of ILS that need to be revised. The Cronbach's alpha for the translated ILS is.602 that is reliable enough.