In this paper we aim at modelling the long run behaviour of the Real Effective Exchange Rates (REER) for a pool of African countries. Not much attention has been paid to this group of countries, in particular, to the existence of nonlinearities in the long run path of such a variable. Controlling for two sources of nonlinearites, i.e. asymmetric adjustment to equilibrium and nonlinear deterministic trends allows us to gain some insight about the behaviour of the African REER. We find that these sources of nonlinearites help us to explain the apparent unit root behaviour found applying linear unit root tests for most of the countries.J.E.L. Classification : C32, F15. Key words: PPP, Real Exchange Rate, Unit Roots, Nonlinearities. † Corresponding author: Nottingham Business School, Division of Economics, Nottingham Trent University, Burton Street, NG1 4BU, Nottingham, UK. e-mail: juan.cuestas@ntu.ac.uk. Juan Carlos Cuestas gratefully acknowledges the financial support from the CICYT and FEDER project SEJ2005-01163 and the Bancaja project P1.1B2005-03. The authors gratefully acknowledge an anonymous referee for his/her helpful comments. Juan Carlos Cuestas is a member of the INTECO research group. The usual disclaimer applies.