Fixes #19667. Change-Id: Iaa71e2020af123c1bd3ac25e0b760956688e8bdf Reviewed-on: https://go-review.googlesource.com/38458 Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>