diff --git a/pkgs/development/python-modules/nox/default.nix b/pkgs/development/python-modules/nox/default.nix
index 2751d971c175d..760687f0bc84d 100644
--- a/pkgs/development/python-modules/nox/default.nix
+++ b/pkgs/development/python-modules/nox/default.nix
@@ -50,7 +50,7 @@ buildPythonPackage rec {
     uv = [ uv ];
   };
 
-  nativeCheckInputs = [ pytestCheckHook ] ++ lib.flatten (builtins.attrValues optional-dependencies);
+  nativeCheckInputs = [ pytestCheckHook ];
 
   preCheck = ''
     export HOME=$(mktemp -d)