diff --git a/raster/r.sim/r.sim.sediment/main.c b/raster/r.sim/r.sim.sediment/main.c
index 8d49778d408..53252b9891f 100644
--- a/raster/r.sim/r.sim.sediment/main.c
+++ b/raster/r.sim/r.sim.sediment/main.c
@@ -387,7 +387,7 @@ int main(int argc, char *argv[])
                   threads, abs(threads));
         threads = abs(threads);
     }
-    if (threads > 1 && Rast_mask_is_present()) {
+    if (threads > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
         G_warning(_("Parallel processing disabled due to active mask."));
         threads = 1;
     }
diff --git a/raster/r.sim/r.sim.water/main.c b/raster/r.sim/r.sim.water/main.c
index 3c0f045a534..f78c05fc648 100644
--- a/raster/r.sim/r.sim.water/main.c
+++ b/raster/r.sim/r.sim.water/main.c
@@ -415,7 +415,7 @@ int main(int argc, char *argv[])
                   threads, abs(threads));
         threads = abs(threads);
     }
-    if (threads > 1 && Rast_mask_is_present()) {
+    if (threads > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
         G_warning(_("Parallel processing disabled due to active mask."));
         threads = 1;
     }