diff --git a/docs/static/includes/interfaces/int.cmk.schema.tf b/docs/static/includes/interfaces/int.cmk.schema.tf
index 3996e0652..7b2ca61e3 100644
--- a/docs/static/includes/interfaces/int.cmk.schema.tf
+++ b/docs/static/includes/interfaces/int.cmk.schema.tf
@@ -5,5 +5,5 @@ variable "customer_managed_key" {
     key_version                        = optional(string, null)
     user_assigned_identity_resource_id = optional(string, null)
   })
-  default = {}
+  default = null
 }