diff --git a/azure_devops_agent/main.tf b/azure_devops_agent/main.tf
index c152278b..7a9a4dd6 100644
--- a/azure_devops_agent/main.tf
+++ b/azure_devops_agent/main.tf
@@ -79,6 +79,7 @@ resource "azurerm_linux_virtual_machine_scale_set" "this" {
       # Ignore changes to these tags because they are generated by az devops.
       tags["__AzureDevOpsElasticPool"],
       tags["__AzureDevOpsElasticPoolTimeStamp"],
+      instances
     ]
   }