Fixes #22849

Change-Id: Icf7f07d0d1d0669f5db4943030588646c819c62a
Reviewed-on: https://go-review.googlesource.com/79495
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>