diff --git a/src/io/pipe_test.go b/src/io/pipe_test.go
index 8973360740..c5fa017fa5 100644
--- a/src/io/pipe_test.go
+++ b/src/io/pipe_test.go
@@ -286,7 +286,7 @@ func TestWriteNil(t *testing.T) {
 
 func TestWriteAfterWriterClose(t *testing.T) {
 	r, w := Pipe()
-
+	defer r.Close()
 	done := make(chan bool)
 	var writeErr error
 	go func() {