diff --git a/main.tf b/main.tf
index 1d49280710ba533c268c203073e93b4d567ade1e..f4decc98559934a3984cece76931159a9aeedb91 100644
--- a/main.tf
+++ b/main.tf
@@ -72,7 +72,7 @@ module "create-ohpc-instance" {
     floating_ip_ohpc = module.floating-ip-address.ohpc_address
     ohpc_user =  var.ohpc_user
     ssh_private_key = var.ssh_private_key
-    volumes = [
+    vol_id = [
       data.openstack_blockstorage_volume_v3.disk.id,
       data.openstack_blockstorage_volume_v3.disk2.id
     ]