diff --git a/sms-notify.tf b/sms-notify.tf
index 71134270b504e971e69dc9178a90bc53b90fb7ee..27047ee97eaf80d4749132367d039a6c9c007fd4 100644
--- a/sms-notify.tf
+++ b/sms-notify.tf
@@ -1,5 +1,6 @@
 variable "messagebird_access_key" {
   description = "MessageBird API access key."
+  sensitive   = true
 }
 
 # It would have been nicer to buy the phone number with Terraform and the