diff --git a/profiles/DerGeret/Windows/Setup.ps1 b/profiles/DerGeret/Windows/Setup.ps1
index a1866ece..dbae036e 100644
--- a/profiles/DerGeret/Windows/Setup.ps1
+++ b/profiles/DerGeret/Windows/Setup.ps1
@@ -44,7 +44,7 @@ $Global:SetupConfigPostprocessor = {
     # Add space before Windows installation... wha-!? For Linux, ofc! I use Arch Linux, btw.
     $newPartition = $partitionCreations[0].CloneNode($true);
     $newPartition.SelectSingleNode("./ua:Order", $namespace).InnerText = "$newIndex";
-    $newPartition.SelectSingleNode("./ua:Size", $namespace).InnerText = "$(64 * 1024)";
+    $newPartition.SelectSingleNode("./ua:Size", $namespace).InnerText = "$((64 * 1024) - 1024)";
     $null = $partitionCreationContainer.AppendChild($newPartition);
 
     $partitionModificationContainer = $diskConfig.SelectSingleNode("./ua:ModifyPartitions", $namespace);