diff --git a/CN_PREPROD/calculated_service_metrics/main.tf b/CN_PREPROD/calculated_service_metrics/main.tf
index 220e7dd..bf5e607 100644
--- a/CN_PREPROD/calculated_service_metrics/main.tf
+++ b/CN_PREPROD/calculated_service_metrics/main.tf
@@ -16,11 +16,11 @@ terraform {
   
 }
 
-variable CNPREPROD_ENV_URL {}
+variable CN_PREPROD_ENV_URL {}
 variable CN_PREPROD_API_TOKEN {}
 
 
 provider "dynatrace" {
-    dt_env_url    = "${var.CNPREPROD_ENV_URL}"
+    dt_env_url    = "${var.CN_PREPROD_ENV_URL}"
     dt_api_token  = "${var.CN_PREPROD_API_TOKEN}"
 }
\ No newline at end of file