Fixes #14860

Change-Id: Id55ad942d45a104d560a879d6e8e1aa09671789b
Reviewed-on: https://go-review.googlesource.com/22351Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>