diff --git a/templates/install.sh b/templates/install.sh
index 0c99730..d121087 100755
--- a/templates/install.sh
+++ b/templates/install.sh
@@ -944,7 +944,7 @@ cat <<EOF | tee ${target}/etc/default/grub >&2
 GRUB_DEFAULT=0
 GRUB_TIMEOUT=5
 GRUB_DISTRIBUTOR="Parallel Virtual Cluster (PVC) - Debian"
-GRUB_CMDLINE_LINUX="${target_consoles}"
+GRUB_CMDLINE_LINUX="blacklist=hpwdt ${target_consoles}"
 GRUB_TERMINAL_INPUT="console serial"
 GRUB_TERMINAL_OUTPUT="gfxterm serial"
 GRUB_SERIAL_COMMAND="serial --unit=0 --unit=1 --speed=115200"