--- xz-5.1.2alpha/src/xz/file_io.h~	2012-07-04 10:51:14.000000000 -0700
+++ xz-5.1.2alpha/src/xz/file_io.h	2013-01-28 07:40:20.356319426 -0800
@@ -15,7 +15,7 @@
 #if BUFSIZ <= 1024
 #	define IO_BUFFER_SIZE 8192
 #else
-#	define IO_BUFFER_SIZE (BUFSIZ & ~7U)
+#	define IO_BUFFER_SIZE ((BUFSIZ * 8) & ~7U)
 #endif