diff --git a/FFUDevelopment/BuildFFUVM.ps1 b/FFUDevelopment/BuildFFUVM.ps1
index b483dd3..6bee045 100644
--- a/FFUDevelopment/BuildFFUVM.ps1
+++ b/FFUDevelopment/BuildFFUVM.ps1
@@ -580,6 +580,7 @@ class VhdxCacheUpdateItem {
 class VhdxCacheItem {
     [string]$VhdxFileName = ""
     [uint32]$LogicalSectorSizeBytes = ""
+    [uint64]$Disksize = ""
     [string]$WindowsSKU = ""
     [string]$WindowsRelease = ""
     [string]$WindowsVersion = ""
@@ -6418,6 +6419,10 @@ try {
                     if ($vhdxCacheItem.WindowsRelease -ne $WindowsRelease) { WriteLog 'WindowsRelease mismatch, continuing'; continue }
                     if ($vhdxCacheItem.WindowsVersion -ne $WindowsVersion) { WriteLog 'WindowsVersion mismatch, continuing'; continue }
                     if ($vhdxCacheItem.OptionalFeatures -ne $OptionalFeatures) { WriteLog 'OptionalFeatures mismatch, continuing'; continue }
+                    if ($vhdxCacheItem.PSObject.Properties.Name -notcontains 'Disksize') { WriteLog 'Disksize missing in cached config, continuing'; continue }
+                    [uint64]$cachedDisksize = 0
+                    if (-not [uint64]::TryParse([string]$vhdxCacheItem.Disksize, [ref]$cachedDisksize)) { WriteLog "Disksize invalid in cached config ($($vhdxCacheItem.Disksize)), continuing"; continue }
+                    if ($cachedDisksize -ne $Disksize) { WriteLog "Disksize mismatch (cached: $cachedDisksize, current: $Disksize), continuing"; continue }
 
                     $cachedUpdateNames = @()
                     if ($vhdxCacheItem.IncludedUpdates -and $vhdxCacheItem.IncludedUpdates.Count -gt 0) {
@@ -6885,6 +6890,7 @@ try {
         }
         $cachedVHDXInfo.VhdxFileName = $("$VMName.vhdx")
         $cachedVHDXInfo.LogicalSectorSizeBytes = $LogicalSectorSizeBytes
+        $cachedVHDXInfo.Disksize = $Disksize
         $cachedVHDXInfo.WindowsSKU = $WindowsSKU
         $cachedVHDXInfo.WindowsRelease = $WindowsRelease
         $cachedVHDXInfo.WindowsVersion = $WindowsVersion