Fixes #28182

Change-Id: I49c2117fba6325c234512f937ff2edfa9477f52f
Reviewed-on: https://go-review.googlesource.com/c/142886Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>