diff --git a/cluster/gce/util.sh b/cluster/gce/util.sh
index 0edf9f9c095..45ba2aad0ec 100755
--- a/cluster/gce/util.sh
+++ b/cluster/gce/util.sh
@@ -1385,7 +1385,7 @@ function kube-down() {
 function get-replica-name() {
   echo $(gcloud compute instances list \
     --project "${PROJECT}" \
-    --zone "${ZONE}" \
+    --zones "${ZONE}" \
     --regexp "$(get-replica-name-regexp)" \
     --format "value(name)" | head -n1)
 }