diff --git a/pkgs/development/tools/devpi-client/default.nix b/pkgs/development/tools/devpi-client/default.nix
index 5bca8733771..11fa78f1f02 100644
--- a/pkgs/development/tools/devpi-client/default.nix
+++ b/pkgs/development/tools/devpi-client/default.nix
@@ -49,6 +49,8 @@ buildPythonApplication rec {
 
   LC_ALL = "en_US.UTF-8";
 
+  __darwinAllowLocalNetworking = true;
+
   meta = with lib; {
     homepage = "http://doc.devpi.net";
     description = "Client for devpi, a pypi index server and packaging meta tool";
diff --git a/pkgs/development/tools/devpi-server/default.nix b/pkgs/development/tools/devpi-server/default.nix
index 8a484a23349..b5ddda9f08b 100644
--- a/pkgs/development/tools/devpi-server/default.nix
+++ b/pkgs/development/tools/devpi-server/default.nix
@@ -55,6 +55,8 @@ python3Packages.buildPythonApplication rec {
     "TestMirrorIndexThings"
   ];
 
+  __darwinAllowLocalNetworking = true;
+
   meta = with lib;{
     homepage = "http://doc.devpi.net";
     description = "Github-style pypi index server and packaging meta tool";