diff --git a/overlays/nixpak/firefox.nix b/overlays/nixpak/firefox.nix
index 31a7c81..4bae8e0 100644
--- a/overlays/nixpak/firefox.nix
+++ b/overlays/nixpak/firefox.nix
@@ -2,9 +2,9 @@
 # https://github.com/ryan4yin/nix-config/blob/7deed26cc5a3af2072b8c89a688f265607babc80/hardening/nixpaks/firefox.nix
 # https://github.com/schizofox/schizofox/blob/cdf69b2a445ff12680657a3bd44ce7c406bf2ae6/flake/modules/home-manager/default.nix
 
-{ ... }: final: prev: {
+{ cfg, ... }: final: prev: {
   firefox-esr = let
-    sandboxed-firefox-esr = cfg: prev.mkNixPak {
+    sandboxed-firefox-esr = prev.mkNixPak {
       config = { sloth, ... }: {
         app.package = (prev.firefox-esr.override cfg);
         app.binPath = "bin/firefox-esr";