diff --git a/pkg/dart2js_info/test/binary_serialization_test.dart b/pkg/dart2js_info/test/binary_serialization_test.dart
index 73869d551a5..27ac31a1b18 100644
--- a/pkg/dart2js_info/test/binary_serialization_test.dart
+++ b/pkg/dart2js_info/test/binary_serialization_test.dart
@@ -5,7 +5,8 @@
 // @dart = 2.11
 
 import 'dart:convert';
-import 'dart:io';
+import 'dart:io' show File, Platform;
+import 'dart:typed_data' show BytesBuilder;
 
 import 'package:dart2js_info/json_info_codec.dart';
 import 'package:dart2js_info/binary_serialization.dart' as binary;
diff --git a/pkg/dev_compiler/lib/src/kernel/expression_compiler_worker.dart b/pkg/dev_compiler/lib/src/kernel/expression_compiler_worker.dart
index 4ba953c893b..24a6751fbe3 100644
--- a/pkg/dev_compiler/lib/src/kernel/expression_compiler_worker.dart
+++ b/pkg/dev_compiler/lib/src/kernel/expression_compiler_worker.dart
@@ -6,8 +6,9 @@
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io';
+import 'dart:io' show stdin, stdout;
 import 'dart:isolate';
+import 'dart:typed_data' show BytesBuilder;
 
 import 'package:args/args.dart';
 import 'package:build_integration/file_system/multi_root.dart';