diff --git a/nixos/modules/virtualisation/hyperv-image.nix b/nixos/modules/virtualisation/hyperv-image.nix
index be2f12b7d01..fabc9113dfc 100644
--- a/nixos/modules/virtualisation/hyperv-image.nix
+++ b/nixos/modules/virtualisation/hyperv-image.nix
@@ -37,6 +37,7 @@ in {
       name = cfg.vmDerivationName;
       postVM = ''
         ${pkgs.vmTools.qemu}/bin/qemu-img convert -f raw -o subformat=dynamic -O vhdx $diskImage $out/${cfg.vmFileName}
+        rm $diskImage
       '';
       format = "raw";
       diskSize = cfg.baseImageSize;