diff --git a/scripts/custom-docker-build b/scripts/custom-docker-build
index a5efa5b..7f3fbe7 100755
--- a/scripts/custom-docker-build
+++ b/scripts/custom-docker-build
@@ -218,7 +218,7 @@ function print_ruby_args() {
 function print_gcloud_args() {
     case "$1" in
         383)
-            BAZELISK_VERSION=383.0.1
+            GCLOUD_VERSION=383.0.1
             ;;
         *) echo "Unknown gcloud version $1"; exit 1;
     esac
@@ -229,9 +229,9 @@ function print_gcloud_args() {
 function print_kubectl_args() {
     case "$1" in
         1.23)
-            BAZELISK_VERSION=1.23.0
+            KUBECTL_VERSION=1.23.0
             ;;
-        *) echo "Unknown gcloud version $1"; exit 1;
+        *) echo "Unknown kubectl version $1"; exit 1;
     esac
 
     printf -- "--build-arg KUBECTL_VERSION=%s " "$KUBECTL_VERSION"