diff --git a/nixos/boxes/form3/default.nix b/nixos/boxes/form3/default.nix
index 16c618df..4c69c9cc 100644
--- a/nixos/boxes/form3/default.nix
+++ b/nixos/boxes/form3/default.nix
@@ -12,7 +12,7 @@
     '';
   };
 
-  fonts.enableFontDir = true;
+  fonts.fontDir.enable = true;
   fonts.fonts = with pkgs; [
     (fetchzip {
       name = "berkeley-mono-fonts";