Sums of independent random variables $S_n = X_1 + X_ + cdots + X_n$ are considered, where the X$_{n}$ are chosen according to a stationary process of distributions. Given the time t .geq. O, let N (t) be the number of indices n for which O < $S_n$ $geq$ t. In this set up we prove that N (t)/t converges almost surely and in $L^1$ as t longrightarrow $infty$, which generalizes classical renewal theorem.m.