diff --git a/nixos/modules/virtualisation/virtualbox-host.nix b/nixos/modules/virtualisation/virtualbox-host.nix
index 91a46ac852b2..7413e12c8f3d 100644
--- a/nixos/modules/virtualisation/virtualbox-host.nix
+++ b/nixos/modules/virtualisation/virtualbox-host.nix
@@ -124,7 +124,7 @@ in
           '';
       };
 
-    networking.interfaces.vboxnet0.ipv4.addresses = { address = "192.168.56.1"; prefixLength = 24; };
+    networking.interfaces.vboxnet0.ipv4.addresses = [{ address = "192.168.56.1"; prefixLength = 24; }];
     # Make sure NetworkManager won't assume this interface being up
     # means we have internet access.
     networking.networkmanager.unmanaged = ["vboxnet0"];