diff --git a/installer/vantage-agent.wxs b/installer/vantage-agent.wxs
index 2f81fbe..ffb1367 100644
--- a/installer/vantage-agent.wxs
+++ b/installer/vantage-agent.wxs
@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<?ifndef Version ?>
 <?define Version = "0.0.0.0" ?>
+<?endif?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
   <Package Name="Vantage Agent" Manufacturer="Vantage"
            Version="$(var.Version)" UpgradeCode="7d1e6d2c-2a5f-4b3e-9c3a-8a1b2c3d4e5f"