diff --git a/pkgs/development/ocaml-modules/domain-local-await/default.nix b/pkgs/development/ocaml-modules/domain-local-await/default.nix
index 9b90e87aa517..a9b5f76839ae 100644
--- a/pkgs/development/ocaml-modules/domain-local-await/default.nix
+++ b/pkgs/development/ocaml-modules/domain-local-await/default.nix
@@ -22,6 +22,7 @@ buildDunePackage rec {
     thread-table
   ];
 
+  __darwinAllowLocalNetworking = true;
   doCheck = true;
 
   checkInputs = [
diff --git a/pkgs/development/ocaml-modules/ssl/default.nix b/pkgs/development/ocaml-modules/ssl/default.nix
index 5d7e3fe2c35f..c3b66f29a24c 100644
--- a/pkgs/development/ocaml-modules/ssl/default.nix
+++ b/pkgs/development/ocaml-modules/ssl/default.nix
@@ -25,6 +25,7 @@ buildDunePackage rec {
   buildInputs = [ dune-configurator ];
   propagatedBuildInputs = [ openssl ];
 
+  __darwinAllowLocalNetworking = true;
   doCheck = lib.versionAtLeast ocaml.version "4.08";
   checkInputs = [ alcotest ];
   preCheck = ''