=== modified file 'lisp/vm-save.el'
--- lisp/vm-save.el	2012-06-09 22:03:33 +0000
+++ lisp/vm-save.el	2012-09-16 12:08:09 +0000
@@ -888,7 +888,7 @@
 	  (let ((work-buffer nil))
 	    (unwind-protect
 		(progn
-		  (setq work-buffer (vm-make-work-buffer))
+		  (setq work-buffer (vm-make-multibyte-work-buffer))
 		  (set-buffer work-buffer)
 		  (vm-insert-region-from-buffer
 		   (vm-buffer-of m) (vm-vheaders-of m) (vm-text-of m))