diff --git a/dev/manual_tests/lib/main.dart b/dev/manual_tests/lib/main.dart
index 04b8d8337c..2ba280b400 100644
--- a/dev/manual_tests/lib/main.dart
+++ b/dev/manual_tests/lib/main.dart
@@ -4,4 +4,9 @@
 
 import 'package:flutter/widgets.dart';
 
-void main() => runApp(const Center(child: Text('flutter run -t xxx.dart')));
+void main() => runApp(const Directionality(
+  textDirection: TextDirection.ltr,
+  child: Center(
+    child: Text('flutter run -t xxx.dart'),
+  ),
+));