fix lint
diff --git a/analysis_options.yaml b/analysis_options.yaml
index 0c32448..a940b32 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -33,7 +33,6 @@
     #- prefer_single_quotes
     #- slash_for_doc_comments
     - test_types_in_equals
-    - test_types_in_equals
     - throw_in_finally
     - type_init_formals
     - unrelated_type_equality_checks
diff --git a/lib/src/utf_stream.dart b/lib/src/utf_stream.dart
index e39a088..7f7cd52 100644
--- a/lib/src/utf_stream.dart
+++ b/lib/src/utf_stream.dart
@@ -12,9 +12,9 @@
 // TODO(floitsch): make this transformer reusable.
 abstract class _StringDecoder extends StreamTransformerBase<List<int>, String>
     implements EventSink<List<int>> {
+  final int _replacementChar;
   List<int> _carry;
   List<int> _buffer;
-  int _replacementChar;
 
   EventSink<String> _outSink;