Follow-up to CL 58371.

Change-Id: I3d2aaec84ee6db3ef1bd4fcfcaf46cc297c7176b
Reviewed-on: https://go-review.googlesource.com/58610
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>