Fixes #14964

Change-Id: I5f772426081efaa9315c4ecaf60de850af324f1d
Reviewed-on: https://go-review.googlesource.com/21139Reviewed-by: Ahmed Waheed <oneofone@gmail.com>
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>