diff --git a/aks.tf b/aks.tf
index b838156..b96b57d 100644
--- a/aks.tf
+++ b/aks.tf
@@ -40,6 +40,7 @@ resource "azurerm_kubernetes_cluster" "main" {
     only_critical_addons_enabled = local.node_default_pool.only_critical_addons_enabled
     os_disk_size_gb              = local.node_default_pool.os_disk_size_gb
     os_disk_type                 = local.node_default_pool.os_disk_type
+    os_sku                       = local.node_default_pool.os_sku
     tags                         = local.tags
     vm_size                      = local.node_default_pool.vm_size
     vnet_subnet_id               = local.subnet_id
@@ -74,6 +75,7 @@ resource "azurerm_kubernetes_cluster_node_pool" "user" {
   node_taints           = local.node_user_pool_merged.node_taints
   os_disk_size_gb       = local.node_user_pool.os_disk_size_gb
   os_disk_type          = local.node_user_pool.os_disk_type
+  os_sku                = local.node_user_pool.os_sku
   os_type               = local.node_user_pool.os_type
   priority              = local.node_user_pool.priority
   eviction_policy       = local.node_user_pool.priority == "Spot" ? local.node_user_pool.eviction_policy : null
diff --git a/test/main.tf b/test/main.tf
index e8f7044..d3ee646 100644
--- a/test/main.tf
+++ b/test/main.tf
@@ -99,7 +99,7 @@ module "aks" {
   node_user_pool = {
     min_count  = 1
     node_count = 1
-    os_type    = "Linux"
+    os_type    = "Windows"
   }
   oms = {
     enabled = true
diff --git a/variables.tf b/variables.tf
index 7dff706..5858dad 100644
--- a/variables.tf
+++ b/variables.tf
@@ -43,6 +43,7 @@ variable "node_default_pool" {
     only_critical_addons_enabled = optional(bool, true)
     os_disk_size_gb              = optional(number, 70)
     os_disk_type                 = optional(string, "Ephemeral")
+    os_sku                       = optional(string, null)
     vm_size                      = optional(string, "Standard_D2ds_v5")
   })
   description = "node default system pool for aks"
@@ -61,9 +62,10 @@ variable "node_user_pool" {
     node_count          = optional(number, 2)
     node_labels         = optional(map(any), {})     # needs defaults as we merge it later
     node_taints         = optional(list(string), []) # needs defaults as we concat it later
-    os_type             = optional(string, "Linux")
     os_disk_size_gb     = optional(number, 120)
     os_disk_type        = optional(string, "Ephemeral")
+    os_sku              = optional(string, null)
+    os_type             = optional(string, "Linux")
     priority            = optional(string, "Regular")
     spot_max_price      = optional(number, -1)
     vm_size             = optional(string, "Standard_D4ds_v5")