diff --git a/context-windows/src/context.ps1 b/context-windows/src/context.ps1
index 0dd55141..faffc3c4 100644
--- a/context-windows/src/context.ps1
+++ b/context-windows/src/context.ps1
@@ -1062,8 +1062,8 @@ function extendPartitions($context) {
     # Cmdlet 'Get-Partition' is not in older Windows/Powershell versions
     if (Get-Command -ErrorAction SilentlyContinue -Name Get-Partition) {
         if ([string]$context['GROW_ROOTFS'] -eq '' -or $context['GROW_ROOTFS'].ToUpper() -eq 'YES') {
-            # Add at least C:
-            $drives = "C: $($context['GROW_FS'])"
+            # Add at least system drive
+            $drives = "$env:systemdrive $($context['GROW_FS'])"
         }
         else {
             $drives = "$($context['GROW_FS'])"