diff --git a/raster/r.mfilter/main.c b/raster/r.mfilter/main.c
index d0ae2d3509b..17ecd2182be 100644
--- a/raster/r.mfilter/main.c
+++ b/raster/r.mfilter/main.c
@@ -132,7 +132,10 @@ int main(int argc, char **argv)
                     "threads setting."));
     nprocs = 1;
 #endif
-
+    if (nprocs > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        nprocs = 1;
+    }
     out_name = opt2->answer;
     filt_name = opt3->answer;
 
diff --git a/raster/r.neighbors/main.c b/raster/r.neighbors/main.c
index a515e7505f5..93cbaa9e3da 100644
--- a/raster/r.neighbors/main.c
+++ b/raster/r.neighbors/main.c
@@ -310,7 +310,10 @@ int main(int argc, char *argv[])
                     "threads setting."));
     ncb.threads = 1;
 #endif
-
+    if (ncb.threads > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        ncb.threads = 1;
+    }
     if (strcmp(parm.weighting_function->answer, "none") && flag.circle->answer)
         G_fatal_error(_("-%c and %s= are mutually exclusive"), flag.circle->key,
                       parm.weighting_function->answer);
diff --git a/raster/r.resamp.filter/main.c b/raster/r.resamp.filter/main.c
index 137e2ac4b10..b1f6ed3e530 100644
--- a/raster/r.resamp.filter/main.c
+++ b/raster/r.resamp.filter/main.c
@@ -494,7 +494,10 @@ int main(int argc, char *argv[])
                     "threads setting."));
     nprocs = 1;
 #endif
-
+    if (nprocs > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        nprocs = 1;
+    }
     if (parm.radius->answer) {
         if (parm.x_radius->answer || parm.y_radius->answer)
             G_fatal_error(_("%s= and %s=/%s= are mutually exclusive"),
diff --git a/raster/r.resamp.interp/main.c b/raster/r.resamp.interp/main.c
index dc149e66519..734f3306bf8 100644
--- a/raster/r.resamp.interp/main.c
+++ b/raster/r.resamp.interp/main.c
@@ -132,7 +132,10 @@ int main(int argc, char *argv[])
                     "threads setting."));
     threads = 1;
 #endif
-
+    if (threads > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        threads = 1;
+    }
     bufrows = atoi(memory->answer) * (((1 << 20) / sizeof(DCELL)) / dst_w.cols);
     /* set the output buffer rows to be at most covering the entire map */
     if (bufrows > dst_w.rows) {
diff --git a/raster/r.series/main.c b/raster/r.series/main.c
index 8526bd6b1d9..2997877decc 100644
--- a/raster/r.series/main.c
+++ b/raster/r.series/main.c
@@ -227,7 +227,10 @@ int main(int argc, char *argv[])
                     "threads setting."));
     nprocs = 1;
 #endif
-
+    if (nprocs > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        nprocs = 1;
+    }
     lo = -INFINITY;
     hi = INFINITY;
     if (parm.range->answer) {
diff --git a/raster/r.sim/r.sim.sediment/main.c b/raster/r.sim/r.sim.sediment/main.c
index f2fe7984ade..fcdd9e98f89 100644
--- a/raster/r.sim/r.sim.sediment/main.c
+++ b/raster/r.sim/r.sim.sediment/main.c
@@ -380,6 +380,10 @@ int main(int argc, char *argv[])
 #else
     threads = 1;
 #endif
+    if (threads > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        threads = 1;
+    }
     G_message(_("Number of threads: %d"), threads);
 
     /*      sscanf(parm.nwalk->answer, "%d", &wp.maxwa); */
diff --git a/raster/r.sim/r.sim.water/main.c b/raster/r.sim/r.sim.water/main.c
index c7c99564e51..3998e5524ac 100644
--- a/raster/r.sim/r.sim.water/main.c
+++ b/raster/r.sim/r.sim.water/main.c
@@ -407,6 +407,10 @@ int main(int argc, char *argv[])
 #else
     threads = 1;
 #endif
+    if (threads > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        threads = 1;
+    }
     G_message(_("Number of threads: %d"), threads);
 
     /* if no rain map input, then: */
diff --git a/raster/r.slope.aspect/main.c b/raster/r.slope.aspect/main.c
index 83a2d309e5b..10fa97a66f0 100644
--- a/raster/r.slope.aspect/main.c
+++ b/raster/r.slope.aspect/main.c
@@ -305,7 +305,10 @@ int main(int argc, char *argv[])
                     "threads setting."));
     nprocs = 1;
 #endif
-
+    if (nprocs > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        nprocs = 1;
+    }
     radians_to_degrees = 180.0 / M_PI;
     degrees_to_radians = M_PI / 180.0;
 
diff --git a/raster/r.sun/main.c b/raster/r.sun/main.c
index 3ed5f93711c..30cd8af9b10 100644
--- a/raster/r.sun/main.c
+++ b/raster/r.sun/main.c
@@ -591,6 +591,10 @@ int main(int argc, char *argv[])
 #else
     threads = 1;
 #endif
+    if (threads > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        threads = 1;
+    }
     G_message(_("Number of threads <%d>"), threads);
 
     if (civiltime != NULL) {
diff --git a/raster/r.univar/r.univar_main.c b/raster/r.univar/r.univar_main.c
index 5d38e54e586..3c070ca827d 100644
--- a/raster/r.univar/r.univar_main.c
+++ b/raster/r.univar/r.univar_main.c
@@ -188,7 +188,10 @@ int main(int argc, char *argv[])
                     "threads setting."));
     nprocs = 1;
 #endif
-
+    if (nprocs > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        nprocs = 1;
+    }
     /* table field separator */
     zone_info.sep = G_option_to_separator(param.separator);
 
diff --git a/vector/v.surf.rst/main.c b/vector/v.surf.rst/main.c
index 95f10e14fc2..4acb2f9c1af 100644
--- a/vector/v.surf.rst/main.c
+++ b/vector/v.surf.rst/main.c
@@ -429,7 +429,10 @@ int main(int argc, char *argv[])
         G_warning(_("GRASS GIS is not compiled with OpenMP support, parallel "
                     "computation is disabled."));
 #endif
-
+    if (threads > 1 && G_find_raster("MASK", G_mapset()) != NULL) {
+        G_warning(_("Parallel processing disabled due to active MASK."));
+        threads = 1;
+    }
     if (devi) {
         create_devi = true;
         if (Vect_legal_filename(devi) == -1)