diff --git a/docker/start-demo.sh b/docker/start-demo.sh
index de44038..0a31939 100755
--- a/docker/start-demo.sh
+++ b/docker/start-demo.sh
@@ -39,7 +39,7 @@ do
    docker kill $i | true
    docker rm $i | true
    cd ./$i 
-   cat <<EOT >> ./env.env
+   cat <<EOT > ./env.env
 KUBERNETES_SERVICE_HOST=$host
 KUBE_CA="$ca"
 KUBE_CERT="$cert"