Crystalline form of abacavir of formula (I), its preparation process which comprises the following steps: a) crystallizing abacavir from a solution of said compound in a (C 1 -C 4 )-alcohol, dichloromethane, acetonitrile/water, or mixtures thereof b) isolating the crystalline form of abacavir that appears in the prior step and c) removing the solvent from the crystalline form of abacavir thus obtained. It can also be obtained by dispersion of abacavir in acetonitrile. It is useful for the preparation of pharmaceutical compositions for use in the treatment and/or prophylaxis of HIV infections.
