diff --git a/lib/src/messages/values.dart b/lib/src/messages/values.dart
index 6bb5de2..388df58 100644
--- a/lib/src/messages/values.dart
+++ b/lib/src/messages/values.dart
@@ -1,7 +1,7 @@
 sealed class Value {}
 
 class StringValue implements Value {
-  String _value;
+  final String _value;
   StringValue(String v) : _value = v;
   String get value => _value;
 }
diff --git a/test/src/auth/credential_provider_test.dart b/test/src/auth/credential_provider_test.dart
index c775316..22733ca 100644
--- a/test/src/auth/credential_provider_test.dart
+++ b/test/src/auth/credential_provider_test.dart
@@ -1,5 +1,3 @@
-import 'dart:html';
-
 import 'package:client_sdk_dart/src/auth/credential_provider.dart';
 import 'package:test/test.dart';
 import 'dart:convert';