diff --git a/pkgs/development/python-modules/cheroot/default.nix b/pkgs/development/python-modules/cheroot/default.nix
index 591bb0fbe37..9b3050942a8 100644
--- a/pkgs/development/python-modules/cheroot/default.nix
+++ b/pkgs/development/python-modules/cheroot/default.nix
@@ -34,6 +34,9 @@ buildPythonPackage rec {
     pytest -k 'not tls' ${lib.optionalString stdenv.isDarwin "--deselect=cheroot/test/test_ssl.py::test_http_over_https_error --deselect=cheroot/test/test_server.py::test_bind_addr_unix"}
   '';
 
+  # Some of the tests use localhost networking.
+  __darwinAllowLocalNetworking = true;
+
   meta = with lib; {
     description = "High-performance, pure-Python HTTP";
     homepage = https://github.com/cherrypy/cheroot;