diff --git a/nixos/modules/programs/virtualbox-host.nix b/nixos/modules/programs/virtualbox-host.nix
index 45d5ec01d302..25f17e3c0607 100644
--- a/nixos/modules/programs/virtualbox-host.nix
+++ b/nixos/modules/programs/virtualbox-host.nix
@@ -16,7 +16,7 @@ in
     };
   };
 
-  config = mkIf config.services.virtualboxHost.enable {
+  config = mkIf config.services.virtualboxHost.enable (mkMerge [{
     boot.kernelModules = [ "vboxdrv" "vboxnetadp" "vboxnetflt" ];
     boot.extraModulePackages = [ virtualbox ];
     environment.systemPackages = [ virtualbox ];
@@ -51,7 +51,7 @@ in
       '';
 
     # Since we lack the right setuid binaries, set up a host-only network by default.
-  } // mkIf config.services.virtualboxHost.addNetworkInterface {
+  } (mkIf config.services.virtualboxHost.addNetworkInterface {
     systemd.services."vboxnet0" =
       { description = "VirtualBox vboxnet0 Interface";
         requires = [ "dev-vboxnetctl.device" ];
@@ -73,5 +73,5 @@ in
       };
 
     networking.interfaces.vboxnet0.ip4 = [ { address = "192.168.56.1"; prefixLength = 24; } ];
-  };
+  })]);
 }