As a consequence, in the era of globalization, the migration of workers and economic flows has grown rapidly over the last decade and has become a phenomenon. Many migrant workers from abroad are employed in certain countries which lack the resources of labor. One of the countries whose economic development depends on migrant workers in Malaysia. Malaysia's dependence on migrant workers is quite high, especially for unskilled and semi-skilled works. However, in addition to skilled/ semi-skilled workers, there are many skilled workers working in Malaysia. They usually work in areas which require expertise or special skills, one of them is in the IT (Information Technology) sector. The purpose of this paper is to study the process of inter-cultural adaptation that occurs in Indonesian professional workers currently working in Malaysia, especially the adaptation process that occurs in their multicultural workplace. This study uses a qualitative methodology of 10 Indonesian professional workers in Malaysia, in particular, working on Nokia Siemens Networks Sdn. Bhd., Malaysia. By conducting research with the qualitative method, the result is the cultural diversity in Malaysia and in the work area of respondents, does not seem to be a big problem for them.