diff --git a/pkg/compiler/test/end_to_end/launch_helper.dart b/pkg/compiler/test/end_to_end/launch_helper.dart
index 2cef2ecc2d9..e7fd0c79659 100644
--- a/pkg/compiler/test/end_to_end/launch_helper.dart
+++ b/pkg/compiler/test/end_to_end/launch_helper.dart
@@ -23,7 +23,6 @@ List<String> dart2JsCommand(List<String> args) {
     basePath = parentPath;
   }
   final command = <String>[];
-  command.add('--no-sound-null-safety');
   if (Platform.packageConfig != null) {
     command.add('--packages=${Platform.packageConfig}');
   }