Fixes #30166

Change-Id: I4704b57ed48197f512cd1b818e1f7d2fffc0d9ce
Reviewed-on: https://go-review.googlesource.com/c/161898
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>