Fix breakage introduced in CL 70530.

Change-Id: I87f3da6b20554d4f405a1143b0d894c5953b63aa
Reviewed-on: https://go-review.googlesource.com/88516
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>