diff --git a/defaults/main.yml b/defaults/main.yml
index 6406982..0a17579 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -2,3 +2,4 @@ grub_cmdline_linux:
 grub_cmdline_linux_default: quiet
 grub_disable_recovery: false
 grub_terminal: console
+boot_devices: "{{ hard_disks | map(attribute='device') | list }}"
diff --git a/tasks/main.yml b/tasks/main.yml
index 8fe23f9..a38cece 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -11,7 +11,8 @@
     dest: "{{ root_target_directory }}/etc/default/grub"
 
 - name: grub-install
-  command: chroot {{ root_target_directory }} grub-install {{ boot_devices | join(" ") }}
+  command: chroot {{ root_target_directory }} grub-install {{ item }}
+  with_items: "{{ boot_devices }}"
 
 - name: update-grub
   command: chroot {{ root_target_directory }} update-grub
@@ -19,7 +20,6 @@
 - name: update initramfs
   command: chroot {{ root_target_directory }} update-initramfs -u
 
-
 - include_role:
     name: chroot_environment
   vars: