diff --git a/lib/features/config_option/data/config_option_repository.dart b/lib/features/config_option/data/config_option_repository.dart
index 7484f12f..ede6ea8b 100644
--- a/lib/features/config_option/data/config_option_repository.dart
+++ b/lib/features/config_option/data/config_option_repository.dart
@@ -106,7 +106,7 @@ abstract class ConfigOptions {
 
   static final tunImplementation = PreferencesNotifier.create<TunImplementation, String>(
     "tun-implementation",
-    TunImplementation.mixed,
+    TunImplementation.gvisor,
     mapFrom: TunImplementation.values.byName,
     mapTo: (value) => value.name,
   );