diff --git a/doc/examples/ex08/ex08.bat b/doc/examples/ex08/ex08.bat
index def8da3dfd0..a629274efbf 100644
--- a/doc/examples/ex08/ex08.bat
+++ b/doc/examples/ex08/ex08.bat
@@ -6,6 +6,6 @@ REM DOS calls:	echo
 REM
 gmt begin ex08
 	gmt makecpt -Ccubhelix -T-5000/0
-	gmt grd2xyz @earth_relief_05m -R0/5/0/5 | gmt plot3d -B -Bz1000+l"Topography (m)" -BWSneZ+b+tETOPO5 -R0/5/0/5/-5000/0 -JM12c -JZ14c -p200/30 -So0.0833333ub-5000 -Wthinnest -C -i0:2,2
+	gmt grd2xyz @earth_relief_05m -R0/5/0/5 | gmt plot3d -B -Bz1000+l"Topography (m)" -BWSneZ+b+tETOPO5 -R0/5/0/5/-5000/0 -JM12c -JZ14c -p200/30 -So0.0833333u+b-5000 -Wthinnest -C -i0:2,2
 	echo 0.1 4.9 This is the surface of cube | gmt text -JZ -Z0 -F+f24p,Helvetica-Bold+jTL -p
 gmt end show
diff --git a/doc/examples/ex08/ex08.sh b/doc/examples/ex08/ex08.sh
index 8a1e216c588..bc021dc8844 100755
--- a/doc/examples/ex08/ex08.sh
+++ b/doc/examples/ex08/ex08.sh
@@ -8,6 +8,6 @@
 gmt begin ex08
 	gmt makecpt -Ccubhelix -T-5000/0
 	gmt grd2xyz @earth_relief_05m -R0/5/0/5 | gmt plot3d -B -Bz1000+l"Topography (m)" -BWSneZ+b+tETOPO5 \
-		-R0/5/0/5/-5000/0 -JM12c -JZ14c -p200/30 -So0.0833333ub-5000 -Wthinnest -C -i0:2,2
+		-R0/5/0/5/-5000/0 -JM12c -JZ14c -p200/30 -So0.0833333u+b-5000 -Wthinnest -C -i0:2,2
 	echo '0.1 4.9 This is the surface of cube' | gmt text -JZ -Z0 -F+f24p,Helvetica-Bold+jTL -p
 gmt end show