Fixes #25423

Change-Id: I6bed0726b8f4c7d607a3df271b2ab1006e96fa75
Reviewed-on: https://go-review.googlesource.com/113356
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>