diff --git a/packages/neon/neon/lib/src/utils/storage.dart b/packages/neon/neon/lib/src/utils/storage.dart
index 06debfa1..2cc6cdcf 100644
--- a/packages/neon/neon/lib/src/utils/storage.dart
+++ b/packages/neon/neon/lib/src/utils/storage.dart
@@ -1,6 +1,6 @@
 part of '../../neon.dart';
 
-class AppStorage extends SettingsStorage {
+class AppStorage implements SettingsStorage {
   AppStorage(
     this._id,
     this._sharedPreferences,
diff --git a/packages/settings/lib/src/storage/storage.dart b/packages/settings/lib/src/storage/storage.dart
index 19910474..f6877174 100644
--- a/packages/settings/lib/src/storage/storage.dart
+++ b/packages/settings/lib/src/storage/storage.dart
@@ -1,6 +1,6 @@
 part of '../../settings.dart';
 
-abstract class SettingsStorage {
+abstract interface class SettingsStorage {
   String? getString(final String key);
 
   Future setString(final String key, final String value);