Fixes #28466

Change-Id: I05b2e0da09394d111913963b60f2ec865c9b4744
Reviewed-on: https://go-review.googlesource.com/c/155931
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>