Fixes #10725

Change-Id: Ic8685dc238a0ffc95fafb512a8587d2eb5fe9d5f
Reviewed-on: https://go-review.googlesource.com/11720Reviewed-by: Adam Langley <agl@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>