diff --git a/src/net/dial_test.go b/src/net/dial_test.go
index 01582489de..5b5faa5424 100644
--- a/src/net/dial_test.go
+++ b/src/net/dial_test.go
@@ -990,6 +990,8 @@ func TestDialerControl(t *testing.T) {
 // except that it won't skip testing on non-mobile builders.
 func mustHaveExternalNetwork(t *testing.T) {
 	t.Helper()
+	t.Skipf("Nix sandbox does not have networking")
+
 	mobile := runtime.GOOS == "android" || runtime.GOOS == "darwin" && runtime.GOARCH == "arm64"
 	if testenv.Builder() == "" || mobile {
 		testenv.MustHaveExternalNetwork(t)