diff --git a/winiso/winfs/Scripts/Startup.ps1 b/winiso/winfs/Scripts/Startup.ps1
index f6311d7c..7d641edd 100644
--- a/winiso/winfs/Scripts/Startup.ps1
+++ b/winiso/winfs/Scripts/Startup.ps1
@@ -1,3 +1,3 @@
 $drives = & wmic volume get "DriveLetter,Label";
-$drive = $($($drives | Select-String -Pattern "winiso-valhalla") -split "\s+")[0];
-Set-Location (Join-Path $drive $env:LOCAL_PROJECT_PATH)
+$env:INSTALLER_DRIVE = $($($drives | Select-String -Pattern "winiso-valhalla") -split "\s+")[0];
+Set-Location (Join-Path $env:INSTALLER_DRIVE $env:LOCAL_PROJECT_PATH)