diff --git a/cluster/kubemark/gce/config-default.sh b/cluster/kubemark/gce/config-default.sh
index 6e66cd73e08..46cd1fef848 100644
--- a/cluster/kubemark/gce/config-default.sh
+++ b/cluster/kubemark/gce/config-default.sh
@@ -19,6 +19,8 @@
 # gce/util.sh script which assumes config filename), but if some things that
 # are enabled by default should not run in hollow clusters, they should be disabled here.
 
+# shellcheck disable=SC2034 # Variables sourced in other scripts.
+
 source "${KUBE_ROOT}/cluster/gce/config-common.sh"
 
 GCLOUD=gcloud
@@ -115,7 +117,7 @@ ENABLE_KUBEMARK_CLUSTER_AUTOSCALER="${ENABLE_KUBEMARK_CLUSTER_AUTOSCALER:-false}
 # (e.g. kubemark master, Heapster) enough resources to handle maximum cluster size.
 if [[ "${ENABLE_KUBEMARK_CLUSTER_AUTOSCALER}" == "true" ]]; then
   NUM_REPLICAS=1
-  if [[ ! -z "$NUM_NODES" ]]; then
+  if [[ -n "$NUM_NODES" ]]; then
     echo "WARNING: Using Cluster Autoscaler, ignoring NUM_NODES parameter. Set KUBEMARK_AUTOSCALER_MAX_NODES to specify maximum size of the cluster."
   fi
 fi
diff --git a/hack/.shellcheck_failures b/hack/.shellcheck_failures
index d805a941c33..f66781abb49 100644
--- a/hack/.shellcheck_failures
+++ b/hack/.shellcheck_failures
@@ -19,7 +19,6 @@
 ./cluster/gce/upgrade.sh
 ./cluster/gce/util.sh
 ./cluster/images/conformance/run_e2e.sh
-./cluster/kubemark/gce/config-default.sh
 ./cluster/kubemark/iks/config-default.sh
 ./cluster/kubemark/util.sh
 ./cluster/log-dump/log-dump.sh