This broke T.Run

Change-Id: I12c8fe3612f3fa2caa83049c1c7003056daf2b0c
Reviewed-on: https://go-review.googlesource.com/21600
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>