diff --git a/Flutter/lib/engine/dokit_binding.dart b/Flutter/lib/engine/dokit_binding.dart
index a9c7a46dc..de527d48f 100644
--- a/Flutter/lib/engine/dokit_binding.dart
+++ b/Flutter/lib/engine/dokit_binding.dart
@@ -8,6 +8,7 @@ import 'package:dokit/kit/kit.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
+import 'package:flutter_test/src/deprecated.dart';
 
 List<String> blackList = <String>[];
 
@@ -37,9 +38,9 @@ extension _BinaryMessengerExt on BinaryMessenger {
   }
 
   // ignore: unused_element
-  bool checkMockMessageHandler(String channel, MessageHandler handler) {
-    return this.checkMockMessageHandler(channel, handler);
-  }
+  // bool checkMockMessageHandler(String channel, MessageHandler handler) {
+  //   return this.checkMockMessageHandler(channel, handler);
+  // }
 }
 
 class DoKitBinaryMessenger extends BinaryMessenger {
diff --git a/Flutter/lib/engine/dokit_http.dart b/Flutter/lib/engine/dokit_http.dart
index d256d8e67..99c2385d8 100644
--- a/Flutter/lib/engine/dokit_http.dart
+++ b/Flutter/lib/engine/dokit_http.dart
@@ -74,14 +74,14 @@ class DoKitHttpClient implements HttpClient {
   @override
   set authenticate(
       Future<bool> Function(Uri url, String scheme, String realm)? f) {
-    origin.authenticate = f;
+    origin.authenticate = f as Future<bool> Function(Uri url, String scheme, String? realm)?;
   }
 
   @override
   set authenticateProxy(
       Future<bool> Function(String host, int port, String scheme, String realm)?
           f) {
-    origin.authenticateProxy = f;
+    origin.authenticateProxy = f as Future<bool> Function(String host, int port, String scheme, String? realm)?;
   }
 
   @override