diff --git a/installer/vantage-agent.wxs b/installer/vantage-agent.wxs
index ffb1367..f3d9986 100644
--- a/installer/vantage-agent.wxs
+++ b/installer/vantage-agent.wxs
@@ -6,7 +6,8 @@
   <Package Name="Vantage Agent" Manufacturer="Vantage"
            Version="$(var.Version)" UpgradeCode="7d1e6d2c-2a5f-4b3e-9c3a-8a1b2c3d4e5f"
            Scope="perMachine">
-    <MajorUpgrade DowngradeErrorMessage="A newer version is already installed." />
+    <MajorUpgrade DowngradeErrorMessage="A newer version is already installed."
+                  Schedule="afterInstallInitialize" />
     <MediaTemplate EmbedCab="yes" />
 
     <!-- Public properties settable via msiexec: SERVERID, TOKEN, SERVERURL -->