diff --git a/pkgs/development/python-modules/mpi4py/default.nix b/pkgs/development/python-modules/mpi4py/default.nix
index 5e1eecd4421a..2c10c4c99447 100644
--- a/pkgs/development/python-modules/mpi4py/default.nix
+++ b/pkgs/development/python-modules/mpi4py/default.nix
@@ -49,6 +49,8 @@ buildPythonPackage rec {
     "demo/futures/test_futures.py"
   ];
 
+  __darwinAllowLocalNetworking = true;
+
   passthru = {
     inherit mpi;
   };