diff --git a/dart/anime/src/pt/animesvision/animesvision.dart b/dart/anime/src/pt/animesvision/animesvision.dart
index 84784a30..ea3fd87a 100644
--- a/dart/anime/src/pt/animesvision/animesvision.dart
+++ b/dart/anime/src/pt/animesvision/animesvision.dart
@@ -11,7 +11,8 @@ class AnimesVision extends MProvider {
   @override
   String get baseUrl => source.baseUrl;
 
-  Map<String, dynamic> get headers => {
+  @override
+  Map<String, String> get headers => {
         "Referer": baseUrl,
         "Accept-Language": "pt-BR,pt;q=0.9,en-US;q=0.8,en;q=0.7"
       };
diff --git a/dart/manga/multisrc/mangareader/mangareader.dart b/dart/manga/multisrc/mangareader/mangareader.dart
index 01b1d95a..1d81c300 100644
--- a/dart/manga/multisrc/mangareader/mangareader.dart
+++ b/dart/manga/multisrc/mangareader/mangareader.dart
@@ -12,7 +12,7 @@ class MangaReader extends MProvider {
   String get baseUrl => getPreferenceValue(source.id, "override_baseurl");
 
   @override
-  Map<String, dynamic> get headers => {"Referer": "$baseUrl/"};
+  Map<String, String> get headers => {"Referer": "$baseUrl/"};
 
   @override
   Future<MPages> getPopular(int page) async {