diff --git a/raster/r.out.vtk/writeascii.c b/raster/r.out.vtk/writeascii.c
index 25015271932..9fb9609f646 100644
--- a/raster/r.out.vtk/writeascii.c
+++ b/raster/r.out.vtk/writeascii.c
@@ -73,7 +73,8 @@ void write_vtk_normal_header(FILE *fp, struct Cell_head region,
 
     /*Simple vtk ASCII header */
     fprintf(fp, "# vtk DataFile Version 3.0\n");
-    fprintf(fp, "GRASS GIS 7 Export\n");
+    /* The header line describes the data. */
+    fprintf(fp, "GRASS GIS %i Export\n", GRASS_VERSION_MAJOR);
     fprintf(fp, "ASCII\n");
     fprintf(fp, "DATASET STRUCTURED_POINTS\n"); /*We are using the structured
                                                    point dataset. */
@@ -104,7 +105,7 @@ void write_vtk_structured_elevation_header(FILE *fp, struct Cell_head region)
 
     /*Simple vtk ASCII header */
     fprintf(fp, "# vtk DataFile Version 3.0\n");
-    fprintf(fp, "GRASS GIS 7 Export\n");
+    fprintf(fp, "GRASS GIS %i Export\n", GRASS_VERSION_MAJOR);
     fprintf(fp, "ASCII\n");
     fprintf(fp, "DATASET STRUCTURED_GRID\n"); /*We are using the structured grid
                                                  dataset. */
@@ -122,7 +123,7 @@ void write_vtk_polygonal_elevation_header(FILE *fp, struct Cell_head region)
 
     /*Simple vtk ASCII header */
     fprintf(fp, "# vtk DataFile Version 3.0\n");
-    fprintf(fp, "GRASS GIS 7 Export\n");
+    fprintf(fp, "GRASS GIS %i Export\n", GRASS_VERSION_MAJOR);
     fprintf(fp, "ASCII\n");
     fprintf(fp, "DATASET POLYDATA\n"); /*We are using polydataset. */
     fprintf(fp, "POINTS %i float\n", region.cols * region.rows);
diff --git a/raster3d/r3.out.vtk/test.r3.out.vtk.sh b/raster3d/r3.out.vtk/testsuite/test_r3_out_vtk.sh
similarity index 87%
rename from raster3d/r3.out.vtk/test.r3.out.vtk.sh
rename to raster3d/r3.out.vtk/testsuite/test_r3_out_vtk.sh
index b931d504537..d2eb43a21e1 100755
--- a/raster3d/r3.out.vtk/test.r3.out.vtk.sh
+++ b/raster3d/r3.out.vtk/testsuite/test_r3_out_vtk.sh
@@ -23,19 +23,19 @@ r3.mapcalc --o expr="volume_rgb = volume_null * 5"
 # The first @test just exports the volume map as cell and point data
 # using alow precision and replaces the default null value with 0
 # the created @files should be compared with the reference data.
-r3.out.vtk --o input=volume_null output=test_volume_null_1_cells.vtk dp=3 null=0
-r3.out.vtk -p --o input=volume_null output=test_volume_null_1_points.vtk dp=3 null=0
+r3.out.vtk --o input=volume_null output=test_volume_null_1_cells.vtk precision=3 null=0
+r3.out.vtk -p --o input=volume_null output=test_volume_null_1_points.vtk precision=3 null=0
 
 # The second @test adds rgb and vector maps. We re-use the created volume map
 # for vector creation. The rgb value must range fom 0 - 255. The generated @files
 # should be compared with the reference data.
-r3.out.vtk --o rgbmaps=volume_rgb,volume_rgb,volume_rgb vectormaps=volume_null,volume_null,volume_null input=volume_null output=test_volume_null_1_cells_rgb_vect.vtk dp=3 null=-1.0
-r3.out.vtk -p --o rgbmaps=volume_rgb,volume_rgb,volume_rgb vectormaps=volume_null,volume_null,volume_null input=volume_null output=test_volume_null_1_points_rgb_vect.vtk dp=3 null=-1.0
+r3.out.vtk --o rgbmaps=volume_rgb,volume_rgb,volume_rgb vectormaps=volume_null,volume_null,volume_null input=volume_null output=test_volume_null_1_cells_rgb_vect.vtk precision=3 null=-1.0
+r3.out.vtk -p --o rgbmaps=volume_rgb,volume_rgb,volume_rgb vectormaps=volume_null,volume_null,volume_null input=volume_null output=test_volume_null_1_points_rgb_vect.vtk precision=3 null=-1.0
 
 # The third @test uses raster maps to create volume data with an elevation surface
 # The maximum elevation should be in the south. Reference @files are present for validation.
-r3.out.vtk -s --o top=elev_top bottom=elev_bottom input=volume_null output=test_volume_null_1_cells_elevation.vtk dp=3 null=0
-r3.out.vtk -sp --o top=elev_top bottom=elev_bottom input=volume_null output=test_volume_null_1_points_elevation.vtk dp=3 null=0
+r3.out.vtk -s --o top=elev_top bottom=elev_bottom input=volume_null output=test_volume_null_1_cells_elevation.vtk precision=3 null=0
+r3.out.vtk -sp --o top=elev_top bottom=elev_bottom input=volume_null output=test_volume_null_1_points_elevation.vtk precision=3 null=0
 
 # Comparison of references and vtk files
 for i in `ls *.ref` ; do
diff --git a/raster3d/r3.out.vtk/test_volume_null_1_cells.ref b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells.ref
similarity index 99%
rename from raster3d/r3.out.vtk/test_volume_null_1_cells.ref
rename to raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells.ref
index 15332af9ccd..704e5724367 100644
--- a/raster3d/r3.out.vtk/test_volume_null_1_cells.ref
+++ b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells.ref
@@ -1,5 +1,5 @@
 # vtk DataFile Version 3.0
-GRASS GIS 7 Export
+GRASS GIS 8 Export
 ASCII
 DATASET STRUCTURED_POINTS
 DIMENSIONS 13 9 6
diff --git a/raster3d/r3.out.vtk/test_volume_null_1_cells_elevation.ref b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells_elevation.ref
similarity index 99%
rename from raster3d/r3.out.vtk/test_volume_null_1_cells_elevation.ref
rename to raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells_elevation.ref
index eb03eba7d2b..910db14526c 100644
--- a/raster3d/r3.out.vtk/test_volume_null_1_cells_elevation.ref
+++ b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells_elevation.ref
@@ -1,5 +1,5 @@
 # vtk DataFile Version 3.0
-GRASS GIS 7 Export
+GRASS GIS 8 Export
 ASCII
 DATASET UNSTRUCTURED_GRID
 POINTS 3840 float
diff --git a/raster3d/r3.out.vtk/test_volume_null_1_cells_rgb_vect.ref b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells_rgb_vect.ref
similarity index 99%
rename from raster3d/r3.out.vtk/test_volume_null_1_cells_rgb_vect.ref
rename to raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells_rgb_vect.ref
index 8695f74b811..b4671f754ab 100644
--- a/raster3d/r3.out.vtk/test_volume_null_1_cells_rgb_vect.ref
+++ b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_cells_rgb_vect.ref
@@ -1,5 +1,5 @@
 # vtk DataFile Version 3.0
-GRASS GIS 7 Export
+GRASS GIS 8 Export
 ASCII
 DATASET STRUCTURED_POINTS
 DIMENSIONS 13 9 6
diff --git a/raster3d/r3.out.vtk/test_volume_null_1_points.ref b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_points.ref
similarity index 99%
rename from raster3d/r3.out.vtk/test_volume_null_1_points.ref
rename to raster3d/r3.out.vtk/testsuite/test_volume_null_1_points.ref
index 22442cbebcc..0fb505bed30 100644
--- a/raster3d/r3.out.vtk/test_volume_null_1_points.ref
+++ b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_points.ref
@@ -1,5 +1,5 @@
 # vtk DataFile Version 3.0
-GRASS GIS 7 Export
+GRASS GIS 8 Export
 ASCII
 DATASET STRUCTURED_POINTS
 DIMENSIONS 12 8 5
diff --git a/raster3d/r3.out.vtk/test_volume_null_1_points_elevation.ref b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_points_elevation.ref
similarity index 99%
rename from raster3d/r3.out.vtk/test_volume_null_1_points_elevation.ref
rename to raster3d/r3.out.vtk/testsuite/test_volume_null_1_points_elevation.ref
index b9e2da97096..dda3ca74922 100644
--- a/raster3d/r3.out.vtk/test_volume_null_1_points_elevation.ref
+++ b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_points_elevation.ref
@@ -1,5 +1,5 @@
 # vtk DataFile Version 3.0
-GRASS GIS 7 Export
+GRASS GIS 8 Export
 ASCII
 DATASET STRUCTURED_GRID
 DIMENSIONS 12 8 5
diff --git a/raster3d/r3.out.vtk/test_volume_null_1_points_rgb_vect.ref b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_points_rgb_vect.ref
similarity index 99%
rename from raster3d/r3.out.vtk/test_volume_null_1_points_rgb_vect.ref
rename to raster3d/r3.out.vtk/testsuite/test_volume_null_1_points_rgb_vect.ref
index 948aa8de4bf..42aeda30ceb 100644
--- a/raster3d/r3.out.vtk/test_volume_null_1_points_rgb_vect.ref
+++ b/raster3d/r3.out.vtk/testsuite/test_volume_null_1_points_rgb_vect.ref
@@ -1,5 +1,5 @@
 # vtk DataFile Version 3.0
-GRASS GIS 7 Export
+GRASS GIS 8 Export
 ASCII
 DATASET STRUCTURED_POINTS
 DIMENSIONS 12 8 5
diff --git a/raster3d/r3.out.vtk/writeVTKHead.c b/raster3d/r3.out.vtk/writeVTKHead.c
index 9215bee508d..1f6c12595bf 100644
--- a/raster3d/r3.out.vtk/writeVTKHead.c
+++ b/raster3d/r3.out.vtk/writeVTKHead.c
@@ -41,7 +41,8 @@ void write_vtk_structured_point_header(FILE *fp, char *vtkFile UNUSED,
     /*Simple vtk ASCII header */
 
     fprintf(fp, "# vtk DataFile Version 3.0\n");
-    fprintf(fp, "GRASS GIS 7 Export\n");
+    /* The header line describes the data. */
+    fprintf(fp, "GRASS GIS %i Export\n", GRASS_VERSION_MAJOR);
     fprintf(fp, "ASCII\n");
     fprintf(fp, "DATASET STRUCTURED_POINTS\n"); /*We are using the structured
                                                    point dataset. */
@@ -100,7 +101,7 @@ void write_vtk_structured_grid_header(FILE *fp, char *vtkFile UNUSED,
         3,
         "write_vtk_structured_grid_header: Writing VTKStructuredGrid-Header");
     fprintf(fp, "# vtk DataFile Version 3.0\n");
-    fprintf(fp, "GRASS GIS 7 Export\n");
+    fprintf(fp, "GRASS GIS %i Export\n", GRASS_VERSION_MAJOR);
     fprintf(fp, "ASCII\n");
     fprintf(fp, "DATASET STRUCTURED_GRID\n"); /*We are using the structured grid
                                                  dataset. */
@@ -122,7 +123,7 @@ void write_vtk_unstructured_grid_header(FILE *fp, char *vtkFile UNUSED,
     G_debug(3, "write_vtk_unstructured_grid_header: Writing "
                "VTKUnstructuredGrid-Header");
     fprintf(fp, "# vtk DataFile Version 3.0\n");
-    fprintf(fp, "GRASS GIS 7 Export\n");
+    fprintf(fp, "GRASS GIS %i Export\n", GRASS_VERSION_MAJOR);
     fprintf(fp, "ASCII\n");
     fprintf(fp, "DATASET UNSTRUCTURED_GRID\n"); /*We are using the unstructured
                                                    grid dataset. */
diff --git a/vector/v.out.vtk/head.c b/vector/v.out.vtk/head.c
index 1a788aee6fa..f2d27e79954 100644
--- a/vector/v.out.vtk/head.c
+++ b/vector/v.out.vtk/head.c
@@ -25,7 +25,9 @@ int write_vtk_head(FILE *fp, struct Map_info *Map)
 {
     G_debug(3, _("writeVTKHeader: Writing VTK-Header"));
     fprintf(fp, "# vtk DataFile Version 3.0\n");
-    fprintf(fp, "GRASS GIS 7 vector map: %s\n", Map->name);
+    /* The header line describes the data. */
+    fprintf(fp, "GRASS GIS %d vector map: %s\n", GRASS_VERSION_MAJOR,
+            Map->name);
     fprintf(fp, "ASCII\n");
     fprintf(fp, "DATASET POLYDATA\n"); /*We are using polydata. If Volume data
                                           is supported, uGrid should be used */