diff --git a/sites/BCN01-LAB/variables.tf b/sites/BCN01-LAB/variables.tf
index e6aaeac..76fe7dd 100755
--- a/sites/BCN01-LAB/variables.tf
+++ b/sites/BCN01-LAB/variables.tf
@@ -4,7 +4,7 @@
 variable "radius_secret" {
   type        = string
   sensitive   = true
-  default     = ""
+  default     = null
   description = "RADIUS shared secret. Pass via TF_VAR_radius_secret (GitHub Secret: RADIUS_SECRET)."
 }