diff --git a/cluster/gke/util.sh b/cluster/gke/util.sh
index 6d4ea3a477..6659c15e8b 100755
--- a/cluster/gke/util.sh
+++ b/cluster/gke/util.sh
@@ -244,7 +244,7 @@ function detect-minion-names {
   detect-project
   detect-node-instance-group
   MINION_NAMES=($(gcloud preview --project "${PROJECT}" instance-groups \
-    --zone "${ZONE}" instances --group "${NODE_INSTANCE_GROUP}" list \
+    --zone "${ZONE}" instances --group "${NODE_INSTANCE_GROUP}" list --quiet \
     | cut -d'/' -f11))
   echo "MINION_NAMES=${MINION_NAMES[*]}"
 }