diff --git a/docs/08-bootstrapping-kubernetes-controllers.md b/docs/08-bootstrapping-kubernetes-controllers.md
index 06012d9..f9ab3b5 100644
--- a/docs/08-bootstrapping-kubernetes-controllers.md
+++ b/docs/08-bootstrapping-kubernetes-controllers.md
@@ -293,7 +293,7 @@ KUBERNETES_PUBLIC_ADDRESS=$(gcloud compute addresses describe kubernetes-the-har
 Make a HTTP request for the Kubernetes version info:
 
 ```
-curl --cacert ca.pem https://${KUBERNETES_PUBLIC_ADDRESS}:6443/version
+curl --cacert ca.pem https://$KUBERNETES_PUBLIC_ADDRESS:6443/version
 ```
 
 > output