diff --git a/pkgs/development/python-modules/equinox/default.nix b/pkgs/development/python-modules/equinox/default.nix
index 5121748a7353..92ce388c8765 100644
--- a/pkgs/development/python-modules/equinox/default.nix
+++ b/pkgs/development/python-modules/equinox/default.nix
@@ -9,6 +9,7 @@
 , typing-extensions
 , beartype
 , optax
+, pytest-xdist
 , pytestCheckHook
 }:
 
@@ -40,6 +41,7 @@ buildPythonPackage rec {
   nativeCheckInputs = [
     beartype
     optax
+    pytest-xdist
     pytestCheckHook
   ];