diff --git a/src/reflect/set_test.go b/src/reflect/set_test.go
index 7c39623a9d..a633e6eee2 100644
--- a/src/reflect/set_test.go
+++ b/src/reflect/set_test.go
@@ -14,8 +14,6 @@ import (
 	"unsafe"
 )
 
-type MyBuffer bytes.Buffer
-
 func TestImplicitMapConversion(t *testing.T) {
 	// Test implicit conversions in MapIndex and SetMapIndex.
 	{
@@ -102,10 +100,7 @@ func TestImplicitMapConversion(t *testing.T) {
 	}
 	{
 		// convert identical underlying types
-		// TODO(rsc): Should be able to define MyBuffer here.
-		// 6l prints very strange messages about .this.Bytes etc
-		// when we do that though, so MyBuffer is defined
-		// at top level.
+		type MyBuffer bytes.Buffer
 		m := make(map[*MyBuffer]*bytes.Buffer)
 		mv := ValueOf(m)
 		b1 := new(MyBuffer)