diff --git a/pkgs/development/python-modules/markdown2/default.nix b/pkgs/development/python-modules/markdown2/default.nix
index d417fb25ca10..e4a6cfd497a0 100644
--- a/pkgs/development/python-modules/markdown2/default.nix
+++ b/pkgs/development/python-modules/markdown2/default.nix
@@ -34,7 +34,7 @@ buildPythonPackage rec {
     code_syntax_highlighting = [ pygments ];
     wavedrom = [ wavedrom ];
     latex = [ latex2mathml ];
-    all = lib.flatten (lib.attrValues (lib.filterAttrs (n: v: n != "all") optional-dependencies));
+    all = lib.flatten (lib.attrValues (lib.removeAttrs optional-dependencies [ "all" ]));
   };
 
   meta = {