diff --git a/main.tf b/main.tf
index 37424a4ca2b431bd2a84664939361ece673a6255..e31f84c1acac90e0474b3a3abec7eefd2bf5cc06 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
-    vol_ids = [
+    vol_id = [
       data.openstack_blockstorage_volume_v3.disk.id,
       data.openstack_blockstorage_volume_v3.disk2.id,
     ]