Fixes golang/go#23361

Change-Id: Ia4fb99b1ac2b109048a1b81f9b1534685f6e31a8
Reviewed-on: https://go-review.googlesource.com/100076
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>