diff --git a/pkgs/development/python-modules/datamodel-code-generator/default.nix b/pkgs/development/python-modules/datamodel-code-generator/default.nix
index 875cb53d382d..4ab9cc01b5a9 100644
--- a/pkgs/development/python-modules/datamodel-code-generator/default.nix
+++ b/pkgs/development/python-modules/datamodel-code-generator/default.nix
@@ -123,6 +123,9 @@ buildPythonPackage (finalAttrs: {
     "test_type_checking_imports_default_to_runtime_imports_for_modular_pydantic_ruff"
   ];
 
+  # Some of the tests use localhost networking.
+  __darwinAllowLocalNetworking = true;
+
   pythonImportsCheck = [ "datamodel_code_generator" ];
 
   meta = {