diff --git a/cluster/aws/util.sh b/cluster/aws/util.sh
index 7c646bfc76b..acd6c14ab6a 100644
--- a/cluster/aws/util.sh
+++ b/cluster/aws/util.sh
@@ -107,7 +107,7 @@ function detect-minions () {
   KUBE_MINION_IP_ADDRESSES=()
   for (( i=0; i<${#MINION_NAMES[@]}; i++)); do
     local minion_ip
-    if [[ "ENABLE_MINION_PUBLIC_IP" == "true" ]]; then
+    if [[ "$ENABLE_MINION_PUBLIC_IP" == "true" ]]; then
       minion_ip=$(get_instance_public_ip ${MINION_NAMES[$i]})
     else
       minion_ip=$(get_instance_private_ip ${MINION_NAMES[$i]})