diff --git a/sdk/lib/io/file_impl.dart b/sdk/lib/io/file_impl.dart
index 66089672b29..0b66b09c760 100644
--- a/sdk/lib/io/file_impl.dart
+++ b/sdk/lib/io/file_impl.dart
@@ -439,7 +439,7 @@ class _RandomAccessFileIOSync implements IOSink {
 
   Future<File?> flush() {
     if (_isClosed) {
-      throw StateError("${_file?.path ?? "IOSink"} is closed");
+      return done;
     }
     if (_isBound) {
       throw StateError("${_file?.path ?? "IOSink"} is bound to a stream");
diff --git a/tests/standalone/io/file_iosink_test.dart b/tests/standalone/io/file_iosink_test.dart
index c4cf4969d32..511697f126f 100644
--- a/tests/standalone/io/file_iosink_test.dart
+++ b/tests/standalone/io/file_iosink_test.dart
@@ -392,13 +392,8 @@ Future<void> testFlushDuringClose(Directory tmpDir) async {
   final sink = file.openWrite();
   final close = sink.close();
 
-  try {
-    await sink.flush();
-  } on StateError catch (e) {
-    Expect.contains('flush_during_close is closed', e.message);
-  }
-
-  await close;
+  Expect.equals(file, await sink.flush());
+  Expect.equals(file, await close);
 }
 
 Future<void> testFailedWrite(Directory tmpDir) async {
diff --git a/tests/standalone_2/io/file_iosink_test.dart b/tests/standalone_2/io/file_iosink_test.dart
index cb57eb9fa03..2518b8939aa 100644
--- a/tests/standalone_2/io/file_iosink_test.dart
+++ b/tests/standalone_2/io/file_iosink_test.dart
@@ -394,13 +394,8 @@ Future<void> testFlushDuringClose(Directory tmpDir) async {
   final sink = file.openWrite();
   final close = sink.close();
 
-  try {
-    await sink.flush();
-  } on StateError catch (e) {
-    Expect.contains('flush_during_close is closed', e.message);
-  }
-
-  await close;
+  Expect.equals(file, await sink.flush());
+  Expect.equals(file, await close);
 }
 
 Future<void> testFailedWrite(Directory tmpDir) async {