diff --git a/kube.tf b/kube.tf
index 9cd619e..b42f59d 100644
--- a/kube.tf
+++ b/kube.tf
@@ -37,15 +37,19 @@ resource "openstack_compute_instance_v2" "kube" {
   network {
     port   = resource.openstack_networking_port_v2.kubeport[count.index].id
   }
+
   block_device {
   uuid             = resource.openstack_blockstorage_volume_v3.kubevolumeboot[count.index].id
   source_type      = "volume"
   destination_type = "volume"
+  boot_index       = 0
   }
+
   block_device {
   uuid             = resource.openstack_blockstorage_volume_v3.kubevolumesnap[count.index].id
   source_type      = "volume"
   destination_type = "volume"
+  boot_index       = -1
   }
 }