diff --git a/pkgs/development/ocaml-modules/tcpip/default.nix b/pkgs/development/ocaml-modules/tcpip/default.nix
index 90100c2d5b57..30710bfae265 100644
--- a/pkgs/development/ocaml-modules/tcpip/default.nix
+++ b/pkgs/development/ocaml-modules/tcpip/default.nix
@@ -63,6 +63,7 @@ buildDunePackage rec {
     mirage-clock-unix
     ipaddr-cstruct
   ];
+  __darwinAllowLocalNetworking = true;
 
   meta = with lib; {
     description = "OCaml TCP/IP networking stack, used in MirageOS";