Thanks to Régis Leroy for noticing.

Change-Id: I5ca2402efddab4e63d884a9d315fc1394e514cb7
Reviewed-on: https://go-review.googlesource.com/18871Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>