diff --git a/pkgs/http_client_conformance_tests/lib/src/response_status_line_tests.dart b/pkgs/http_client_conformance_tests/lib/src/response_status_line_tests.dart
index 664134bb54..c23de7c7a1 100644
--- a/pkgs/http_client_conformance_tests/lib/src/response_status_line_tests.dart
+++ b/pkgs/http_client_conformance_tests/lib/src/response_status_line_tests.dart
@@ -15,7 +15,7 @@ import 'response_status_line_server_vm.dart'
 /// If [reasonableInvalidStatusLineHandling] is `false` the tests related to
 /// invalid `Status-Line`s are skipped.
 void testResponseStatusLine(Client client,
-    {required bool reasonableInvalidStatusLineHandling}) async {
+    {bool reasonableInvalidStatusLineHandling = true}) async {
   group('response status line', () {
     late String host;
     late StreamChannel<Object?> httpServerChannel;