diff --git a/cluster/gce/trusty/configure-helper.sh b/cluster/gce/trusty/configure-helper.sh
index 5b0b5708a1e..7d818856096 100644
--- a/cluster/gce/trusty/configure-helper.sh
+++ b/cluster/gce/trusty/configure-helper.sh
@@ -483,7 +483,7 @@ start_kube_controller_manager() {
   if [ -n "${CLUSTER_IP_RANGE:-}" ]; then
     params="${params} --cluster-cidr=${CLUSTER_IP_RANGE}"
   fi
-  if [ -n "${SERVICE_IP_RANGE:-}" ]; then
+  if [ -n "${SERVICE_CLUSTER_IP_RANGE:-}" ]; then
     params="${params} --service-cluster-ip-range=${SERVICE_CLUSTER_IP_RANGE}"
   fi
   if [ "${ALLOCATE_NODE_CIDRS:-}" = "true" ]; then