Fixes #25611

Change-Id: I487463584e4d9d99cf5d8db0c9a4b4e66464ecd8
Reviewed-on: https://go-review.googlesource.com/114935
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>