diff --git a/uuencode.h b/uuencode.h
index fec55b4..4d98881 100644
--- a/uuencode.h
+++ b/uuencode.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: uuencode.h,v 1.13 2006/08/03 03:34:42 deraadt Exp $ */
+/* $OpenBSD: uuencode.h,v 1.14 2010/08/31 11:54:45 djm Exp $ */
 
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
@@ -26,4 +26,4 @@
 
 int	 uuencode(const u_char *, u_int, char *, size_t);
 int	 uudecode(const char *, u_char *, size_t);
-void	 dump_base64(FILE *, u_char *, u_int);
+void	 dump_base64(FILE *, const u_char *, u_int);