diff --git a/update.sh b/update.sh
index 4066d17..44ef4c1 100644
--- a/update.sh
+++ b/update.sh
@@ -4,16 +4,16 @@ if [ -z ${PLUGIN_NAMESPACE} ]; then
   PLUGIN_NAMESPACE="default"
 fi
 
-if [ -z PLUGIN_KUBERNETES_TOKEN ]; then
-  PLUGIN_KUBERNETES_TOKEN=$KUBERNETES_TOKEN
+if [ ! -z ${PLUGIN_KUBERNETES_TOKEN} ]; then
+  KUBERNETES_TOKEN=$PLUGIN_KUBERNETES_TOKEN
 fi
 
-if [ -z PLUGIN_KUBERNETES_SERVER ]; then
-  PLUGIN_KUBERNETES_SERVER=$KUBERNETES_SERVER
+if [ ! -z ${PLUGIN_KUBERNETES_SERVER} ]; then
+  KUBERNETES_SERVER=$PLUGIN_KUBERNETES_SERVER
 fi
 
-kubectl config set-credentials default --token=${PLUGIN_KUBERNETES_TOKEN}
-kubectl config set-cluster default --server=${PLUGIN_KUBERNETES_SERVER} --insecure-skip-tls-verify=true
+kubectl config set-credentials default --token=${KUBERNETES_TOKEN}
+kubectl config set-cluster default --server=${KUBERNETES_SERVER} --insecure-skip-tls-verify=true
 kubectl config set-context default --cluster=default --user=default
 kubectl config use-context default
 kubectl -n ${PLUGIN_NAMESPACE} set image deployment/${PLUGIN_DEPLOYMENT} ${PLUGIN_CONTAINER}=${PLUGIN_REPO}:${PLUGIN_TAG}