diff --git a/codex/testutil.go b/codex/testutil.go
index 274495b..dabce04 100644
--- a/codex/testutil.go
+++ b/codex/testutil.go
@@ -15,6 +15,7 @@ func defaultConfigHelper(t *testing.T) Config {
 		MetricsEnabled: false,
 		BlockRetries:   3000,
 		LogLevel:       "ERROR",
+		Nat:            "none",
 	}
 }