diff --git a/scripts/updateUID.Dockerfile b/scripts/updateUID.Dockerfile
index 9f6c9a854..afc653cd8 100644
--- a/scripts/updateUID.Dockerfile
+++ b/scripts/updateUID.Dockerfile
@@ -1,6 +1,6 @@
 #  Copyright (c) Microsoft Corporation. All rights reserved.
 #  Licensed under the MIT License. See License.txt in the project root for license information.
-ARG BASE_IMAGE
+ARG BASE_IMAGE="scratch"
 FROM $BASE_IMAGE
 
 USER root