diff --git a/build.ps1 b/build.ps1
index 73159c40a4..3f8a20d416 100644
--- a/build.ps1
+++ b/build.ps1
@@ -2,6 +2,7 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 
+[CmdletBinding(DefaultParameterSetName = "Build")]
 param(
     [Parameter(ParameterSetName="Bootstrap")]
     [switch]