diff --git a/nixos/modules/virtualisation/virtualbox-image.nix b/nixos/modules/virtualisation/virtualbox-image.nix
index 3a598a1c7dc..b6a5b3e4788 100644
--- a/nixos/modules/virtualisation/virtualbox-image.nix
+++ b/nixos/modules/virtualisation/virtualbox-image.nix
@@ -8,6 +8,8 @@ let
 
 in {
 
+  imports = [ ./grow-partition.nix ];
+
   options = {
     virtualbox = {
       baseImageSize = mkOption {
@@ -64,7 +66,10 @@ in {
         '';
     };
 
-    fileSystems."/".device = "/dev/disk/by-label/nixos";
+    fileSystems."/" = {
+      device = "/dev/disk/by-label/nixos";
+      autoResize = true;
+    };
 
     boot.loader.grub.device = "/dev/sda";