diff --git a/src/io/multi_test.go b/src/io/multi_test.go
index 7a24a8afc5..934a6ec785 100644
--- a/src/io/multi_test.go
+++ b/src/io/multi_test.go
@@ -332,9 +332,7 @@ func TestMultiReaderFreesExhaustedReaders(t *testing.T) {
 		buf1 := bytes.NewReader([]byte("foo"))
 		buf2 := bytes.NewReader([]byte("bar"))
 		mr = MultiReader(buf1, buf2)
-		runtime.SetFinalizer(buf1, func(*bytes.Reader) {
-			close(closed)
-		})
+		runtime.AddCleanup(buf1, func(ch chan struct{}) { close(ch) }, closed)
 	}()
 
 	buf := make([]byte, 4)