4-4-methylpiperazin-1-ylmethyl-N-[4-methyl-3-4-pyridin-3-ylpyrimidin-2-ylaminophenyl]-benzamide of the formula I, or a pharmaceutically acceptable salt thereof can be used in the treatment of rheumatoid arthritis. The invention also relates to a combination of the compound of the formula I or a pharmaceutically acceptable salt thereof with one or more disease modifying arthritis rheumatoid drugs (DMARDs).