diff --git a/raster/r.sim/simlib/hydro.c b/raster/r.sim/simlib/hydro.c
index 0c03eb2476d..2bcc53bcc88 100644
--- a/raster/r.sim/simlib/hydro.c
+++ b/raster/r.sim/simlib/hydro.c
@@ -150,21 +150,10 @@ void main_loop(const Setup *setup, const Geometry *geometry,
             nwalka = 0;
             sim->nstack = 0;
 
-#pragma omp parallel firstprivate(l, lw, k) reduction(+ : nwalka)
+#pragma omp parallel firstprivate(l, k) reduction(+ : nwalka)
             {
-#if defined(_OPENMP)
-                int steps = (sim->nwalk + omp_get_num_threads() - 1) /
-                            omp_get_num_threads();
-                int tid = omp_get_thread_num();
-                int min_loop = tid * steps;
-                int max_loop = ((tid + 1) * steps) > sim->nwalk
-                                   ? sim->nwalk
-                                   : (tid + 1) * steps;
-
-                for (lw = min_loop; lw < max_loop; lw++) {
-#else
+#pragma omp for schedule(static)
                 for (lw = 0; lw < sim->nwalk; lw++) {
-#endif
                     if (sim->w[lw].m > EPS) { /* check the walker weight */
                         ++(nwalka);
                         l = (int)((sim->w[lw].x + stxm) / geometry->stepx) -