Fixes #22349

Change-Id: I84ec4fa9fa95bac0f26bf4ca3e62a35dff4f7e00
Reviewed-on: https://go-review.googlesource.com/86015
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>