diff --git a/pkgs/development/python-modules/safetensors/default.nix b/pkgs/development/python-modules/safetensors/default.nix
index 0aa729c20e54..4005a620d8a6 100644
--- a/pkgs/development/python-modules/safetensors/default.nix
+++ b/pkgs/development/python-modules/safetensors/default.nix
@@ -55,6 +55,9 @@ buildPythonPackage rec {
     "tests/test_flax_comparison.py"
     "tests/test_paddle_comparison.py"
     "tests/test_tf_comparison.py"
+  ] ++ lib.optionals stdenv.isDarwin [
+    # don't require mlx (not in Nixpkgs) to run tests
+    "tests/test_mlx_comparison.py"
   ];
 
   pythonImportsCheck = [