MiB.

Fixes #10531

Change-Id: I9eece86837c3df2b1f7df315d5ec94bd3ede3eec
Reviewed-on: https://go-review.googlesource.com/9238
Run-TryBot: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>