diff --git a/cluster/kubemark/gce/config-default.sh b/cluster/kubemark/gce/config-default.sh
index 5f15ee866c..6e66cd73e0 100644
--- a/cluster/kubemark/gce/config-default.sh
+++ b/cluster/kubemark/gce/config-default.sh
@@ -25,6 +25,7 @@ GCLOUD=gcloud
 ZONE=${KUBE_GCE_ZONE:-us-central1-b}
 REGION=${ZONE%-*}
 NUM_NODES=${KUBEMARK_NUM_NODES:-10}
+NUM_WINDOWS_NODES=${KUBEMARK_NUM_WINDOWS_NODES:-0}
 MASTER_SIZE=${KUBEMARK_MASTER_SIZE:-n1-standard-$(get-master-size)}
 MASTER_DISK_TYPE=pd-ssd
 MASTER_DISK_SIZE=${MASTER_DISK_SIZE:-$(get-master-disk-size)}