diff --git a/pkgs/development/python-modules/snitun/default.nix b/pkgs/development/python-modules/snitun/default.nix
index 6926926605b9..1540fcaec9de 100644
--- a/pkgs/development/python-modules/snitun/default.nix
+++ b/pkgs/development/python-modules/snitun/default.nix
@@ -8,7 +8,6 @@
   pytest-aiohttp,
   pytest-codspeed,
   pytestCheckHook,
-  pythonAtLeast,
   setuptools,
 }:
 
@@ -24,6 +23,11 @@ buildPythonPackage rec {
     hash = "sha256-luXv5J0PUvW+AGTecwkEq+qkG1N5Ja5NbBKJ3M6HC0I=";
   };
 
+  patches = [
+    # https://github.com/NabuCasa/snitun/pull/459
+    ./fix-python-3.14-compatibility.diff
+  ];
+
   postPatch = ''
     substituteInPlace pyproject.toml \
       --replace-fail 'version = "0.0.0"' 'version = "${version}"'
diff --git a/pkgs/development/python-modules/snitun/fix-python-3.14-compatibility.diff b/pkgs/development/python-modules/snitun/fix-python-3.14-compatibility.diff
new file mode 100644
index 000000000000..b9d849f76f43
--- /dev/null
+++ b/pkgs/development/python-modules/snitun/fix-python-3.14-compatibility.diff
@@ -0,0 +1,23 @@
+diff --git a/tests/conftest.py b/tests/conftest.py
+index 78594e7..1b9c184 100644
+--- a/tests/conftest.py
++++ b/tests/conftest.py
+@@ -5,9 +5,11 @@
+ from dataclasses import dataclass, field
+ from datetime import UTC, datetime, timedelta
+ import logging
++import multiprocessing
+ import os
+ import select
+ import socket
++import sys
+ from threading import Thread
+ from unittest.mock import patch
+ 
+@@ -338,3 +340,6 @@ async def test_client_peer(peer_listener: PeerListener) -> AsyncGenerator[Client
+     yield Client(reader, writer)
+ 
+     writer.close()
++
++if sys.platform == "linux":
++    multiprocessing.set_start_method("fork", force=True)