Fix build break on win32

Change-Id: Ib2abefc9bc5a5bca77064062ae3fe35d5fe3e352
Reviewed-on: http://review.couchbase.org/42416
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Daniel Owen <owend@couchbase.com>
Tested-by: Daniel Owen <owend@couchbase.com>