diff --git a/variables.tf b/variables.tf
index 5f207b9..7e63d46 100644
--- a/variables.tf
+++ b/variables.tf
@@ -94,4 +94,5 @@ variable "node_pools" {
 variable subscription_id {
   type        = string
   description = "An existing Subscription ID to add the deployment"
-}
\ No newline at end of file
+  default     = ""
+}