We analyze the problem of real optimal asset allocation for a pension fund maximising the expected CRRA utility of its real disposable wealth. The financial horizon of the analysis coincides with the random death time of a representative subscriber. We consider a very general setting where there exists a stochastic investment opportunity set together with stochastic contributions and pensions and we derive a quasi-explicit solution. When the market price of risk is independent of the state variables we are also able to compute a closed-form solution. Numerical simulations provide useful practical guidelines regarding the optimal investment strategy.