diff --git a/pkgs/development/python-modules/pettingzoo/default.nix b/pkgs/development/python-modules/pettingzoo/default.nix
index 1409b29e3633..e8fa3a1ed962 100644
--- a/pkgs/development/python-modules/pettingzoo/default.nix
+++ b/pkgs/development/python-modules/pettingzoo/default.nix
@@ -53,7 +53,7 @@ buildPythonPackage rec {
   ];
 
   optional-dependencies = {
-    all = lib.flatten (lib.attrValues (lib.filterAttrs (n: v: n != "all") optional-dependencies));
+    all = lib.flatten (lib.attrValues (lib.removeAttrs optional-dependencies [ "all" ]));
     atari = [
       # multi-agent-ale-py
       pygame