Fixes #31510

Change-Id: I601d114b617a055380bf3c805e2d9a9b0795b656
Reviewed-on: https://go-review.googlesource.com/c/go/+/175259Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>