diff --git a/post-debootstrap-installer.sh b/post-debootstrap-installer.sh
index 8b6be7f..e9e2d5d 100755
--- a/post-debootstrap-installer.sh
+++ b/post-debootstrap-installer.sh
@@ -32,7 +32,9 @@ sed -i 's/DROPBEAR_PORT=.*/DROPBEAR_PORT=222/' /etc/default/dropbear
 # after cryptsetup, mdadm, ... because of update-initramfs
 apt-get -y install linux-image-amd64
 
+# install grub
 apt-get -y install grub-efi-amd64
+grub-install
 
 # edit esp_uuid in fstab
 esp_uuid=$(blkid --output value "/hardware-setup/hardware/${1}/esp" | head -n1)