diff --git a/quickstart/101-front-door-standard-premium/variables.tf b/quickstart/101-front-door-standard-premium/variables.tf
index 99bfab5f2..f711d2f54 100644
--- a/quickstart/101-front-door-standard-premium/variables.tf
+++ b/quickstart/101-front-door-standard-premium/variables.tf
@@ -32,6 +32,6 @@ variable "front_door_sku_name" {
   default     = "Standard_AzureFrontDoor"
   validation {
     condition     = contains(["Standard_AzureFrontDoor", "Premium_AzureFrontDoor"], var.front_door_sku_name)
-    error_message = "The SKU value must be one of the following: Standard_AzureFrontDoor or Premium_AzureFrontDoor."
+    error_message = "The SKU value must be one of the following: Standard_AzureFrontDoor, Premium_AzureFrontDoor."
   }
 }
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