diff --git a/overlays/nixpkgs/firefox.nix b/overlays/nixpkgs/firefox.nix
index 257133a..51f21d6 100644
--- a/overlays/nixpkgs/firefox.nix
+++ b/overlays/nixpkgs/firefox.nix
@@ -3,7 +3,7 @@
 { pkgs, ... }: final: prev: {
   firefox-esr = let
     sandboxed-firefox-esr = pkgs.mkNixPak {
-      config = { sloth, ... }: {
+      config = { sloth, pkgs, ... }: {
         app.package = pkgs.firefox-esr;
         app.binPath = "bin/firefox-esr";
         flatpak.appId = "org.mozilla.firefox";