diff --git a/tests/install/windows-e2e.ps1 b/tests/install/windows-e2e.ps1
index 6b8e3b477e..a9ed4d9c22 100644
--- a/tests/install/windows-e2e.ps1
+++ b/tests/install/windows-e2e.ps1
@@ -72,7 +72,7 @@
 # ============================================================================
 
 param(
-    [ValidateSet("stage", "install", "update", "all")]
+    [ValidateSet("stage", "install", "update", "verify-stamp", "all")]
     [string]$Phase = "all",
 
     # How OLD gets installed, named by the same ids the combination