diff --git a/pkgs/development/tools/buf/default.nix b/pkgs/development/tools/buf/default.nix
index fdf763efb26a..b006db4b4d55 100644
--- a/pkgs/development/tools/buf/default.nix
+++ b/pkgs/development/tools/buf/default.nix
@@ -44,6 +44,9 @@ buildGoModule rec {
     export CI=true
   '';
 
+  # Allow tests that bind or connect to localhost on macOS.
+  __darwinAllowLocalNetworking = true;
+
   installPhase = ''
     runHook preInstall