diff --git a/src/net/tools/naive/naive_proxy_bin.cc b/src/net/tools/naive/naive_proxy_bin.cc
index 792b7106ff..dd5540eef8 100644
--- a/src/net/tools/naive/naive_proxy_bin.cc
+++ b/src/net/tools/naive/naive_proxy_bin.cc
@@ -533,7 +533,10 @@ int main(int argc, char* argv[]) {
 
   auto cert_context = net::BuildCertURLRequestContext(net_log);
   scoped_refptr<net::CertNetFetcherURLRequest> cert_net_fetcher;
-#if defined(OS_LINUX) || defined(OS_MAC) || defined(OS_ANDROID)
+  // The builtin verifier is supported but not enabled by default on Mac,
+  // falling back to CreateSystemVerifyProc() which drops the net fetcher.
+  // Skips defined(OS_MAC) for now, until it is enabled by default.
+#if defined(OS_LINUX) || defined(OS_ANDROID)
   cert_net_fetcher = base::MakeRefCounted<net::CertNetFetcherURLRequest>();
   cert_net_fetcher->SetURLRequestContext(cert_context.get());
 #endif