diff --git a/docker-demo-3/scripts/jenkins-init.sh b/docker-demo-3/scripts/jenkins-init.sh
index 88e2b3e..025a8ac 100644
--- a/docker-demo-3/scripts/jenkins-init.sh
+++ b/docker-demo-3/scripts/jenkins-init.sh
@@ -46,9 +46,9 @@ pip install awscli
 
 # install terraform
 TERRAFORM_VERSION="0.11.7"
-wget -q https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_amd64.zip \
-&& unzip -o terraform_${TERRAFORM_VERSION}_linux_amd64.zip -d /usr/local/bin \
-&& rm terraform_${TERRAFORM_VERSION}_linux_amd64.zip
+wget -q https://releases.hashicorp.com/terraform/$${TERRAFORM_VERSION}/terraform_$${TERRAFORM_VERSION}_linux_amd64.zip \
+&& unzip -o terraform_$${TERRAFORM_VERSION}_linux_amd64.zip -d /usr/local/bin \
+&& rm terraform_$${TERRAFORM_VERSION}_linux_amd64.zip
 
 # clean up
 apt-get clean