diff --git a/terraform/provider.tf b/terraform/provider.tf
index ccd15cc..d5a8468 100644
--- a/terraform/provider.tf
+++ b/terraform/provider.tf
@@ -17,6 +17,12 @@ variable NETBOX_API_TOKEN {
   sensitive   = true
 }
 
+variable NETBOX_SERVER_URL {
+  type        = string
+  description = "netbox Server URL"
+  sensitive   = true
+}
+
 variable HETZNER_API_TOKEN {
   type        = string
   description = "hetzner cloud api token"