diff --git a/pkgs/development/python-modules/pytest-subprocess/default.nix b/pkgs/development/python-modules/pytest-subprocess/default.nix
index 9b61a0526f83..d32aca5b45e4 100644
--- a/pkgs/development/python-modules/pytest-subprocess/default.nix
+++ b/pkgs/development/python-modules/pytest-subprocess/default.nix
@@ -3,6 +3,7 @@
   buildPythonPackage,
   pythonOlder,
   fetchFromGitHub,
+  fetchpatch,
   setuptools,
   pytest,
   pytestCheckHook,
@@ -28,6 +29,14 @@ buildPythonPackage rec {
     hash = "sha256-3vBYOk/P78NOjAbs3fT6py5QOOK3fX+AKtO4j5vxZfk=";
   };
 
+  patches = [
+    (fetchpatch {
+      # python 3.14 compat
+      url = "https://github.com/aklajnert/pytest-subprocess/commit/be30d9a94ba45afb600717e3fcd95b8b2ff2c60e.patch";
+      hash = "sha256-TYk/Zu2MF+ROEKTgZI1rzA2MlW2it++xElfGZS0Dn5s=";
+    })
+  ];
+
   build-system = [ setuptools ];
 
   buildInputs = [ pytest ];