diff --git a/modules/nebula/main.tf b/modules/nebula/main.tf
index de05d75..a0ec02c 100644
--- a/modules/nebula/main.tf
+++ b/modules/nebula/main.tf
@@ -3,10 +3,6 @@ variable "vms" {
     description = "Virtual Machines description"
 }
 
-variable "image_driver" {
-    default = "qcow2"
-}
-
 variable "image_format" {
     default = "qcow2"
 }
@@ -46,7 +42,6 @@ resource "opennebula_image" "system" {
   datastore_id = var.one_prod_ds 
   path = "https://vulcain.cadoles.com/empty_20G"
   persistent = each.value.system_image_persistent
-  driver = var.image_driver
   format = var.image_format
   dev_prefix = var.dev_prefix
   permissions = var.permissions
@@ -61,7 +56,6 @@ resource "opennebula_image" "data" {
   datastore_id = var.one_prod_ds 
   description = "data disk for ${each.key}"
   persistent = each.value.data_image_persistent
-  driver = var.image_driver
   format = var.image_format
   dev_prefix = var.dev_prefix
   permissions = var.permissions