Fixes #19480

Change-Id: I5a621507279d5bb1f3991b7a412d9a63039d464b
Reviewed-on: https://go-review.googlesource.com/38791
Run-TryBot: Sam Whited <sam@samwhited.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>