diff --git a/overlays/nixpkgs/firefox.nix b/overlays/nixpkgs/firefox.nix
index 5eee596..257133a 100644
--- a/overlays/nixpkgs/firefox.nix
+++ b/overlays/nixpkgs/firefox.nix
@@ -73,5 +73,5 @@
       };
     };
   in
-    sandboxed-firefox-esr.config.env;
+    sandboxed-firefox-esr.config.script;
 }