Fixes #31917

Change-Id: I794e457b2245d355e2df5077078c67aa09e00ff9
Reviewed-on: https://go-review.googlesource.com/c/go/+/175920
Run-TryBot: Elias Naur <mail@eliasnaur.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>