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-rw-r--r--nixos/modules/virtualisation/virtualbox-image.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/virtualisation/virtualbox-image.nix b/nixos/modules/virtualisation/virtualbox-image.nix
index 853dd642a76..1a0c4df42cb 100644
--- a/nixos/modules/virtualisation/virtualbox-image.nix
+++ b/nixos/modules/virtualisation/virtualbox-image.nix
@@ -136,7 +136,7 @@ in {
       inherit pkgs lib config;
       partitionTableType = "legacy";
       diskSize = cfg.baseImageSize;
-      additionalSpace = cfg.baseImageFreeSpace;
+      additionalSpace = "${toString cfg.baseImageFreeSpace}M";
 
       postVM =
         ''