diff --git a/data/data/openstack/masters/main.tf b/data/data/openstack/masters/main.tf
index ce4a9b92023..922e1da7062 100644
--- a/data/data/openstack/masters/main.tf
+++ b/data/data/openstack/masters/main.tf
@@ -3,10 +3,9 @@ data "openstack_compute_flavor_v2" "masters_flavor" {
 }
 
 data "ignition_file" "hostname" {
-  count      = var.instance_count
-  filesystem = "root"
-  mode       = "420" // 0644
-  path       = "/etc/hostname"
+  count = var.instance_count
+  mode  = "420" // 0644
+  path  = "/etc/hostname"
 
   content {
     content = <<EOF
@@ -18,7 +17,7 @@ EOF
 data "ignition_config" "master_ignition_config" {
   count = var.instance_count
 
-  append {
+  merge {
     source = "data:text/plain;charset=utf-8;base64,${base64encode(var.user_data_ign)}"
   }