diff --git a/website/source/docs/provisioners/null_resource.html.markdown b/website/source/docs/provisioners/null_resource.html.markdown
index 51a409042..df09c037d 100644
--- a/website/source/docs/provisioners/null_resource.html.markdown
+++ b/website/source/docs/provisioners/null_resource.html.markdown
@@ -44,7 +44,7 @@ resource "null_resource" "cluster" {
   provisioner "remote-exec" {
     # Bootstrap script called with private_ip of each node in the clutser
     inline = [
-      "bootstrap-cluster.sh ${join(" ", aws_instance.cluster.*.private_ip}"
+      "bootstrap-cluster.sh ${join(" ", aws_instance.cluster.*.private_ip)}"
     ]
   }
 }