diff -u hexer-0.1.5/regex.c hexer-0.1.5-patched/regex.c
--- hexer-0.1.5/regex.c	2009-09-04 13:36:56.000000000 +0200
+++ hexer-0.1.5-patched/regex.c	2010-04-04 13:39:11.000000000 +0200
@@ -231,9 +231,9 @@
    * *not* match a newline character.
    */
 
-static char buffer_[3 * REGEX_BLOCKSIZE];
-static char *buffer = buffer_ + REGEX_BLOCKSIZE;
-static char *bp;
+static unsigned char buffer_[3 * REGEX_BLOCKSIZE];
+static unsigned char *buffer = buffer_ + REGEX_BLOCKSIZE;
+static unsigned char *bp;
 static long buffer_base;
 
 #define REGEX_ADVANCE {                                                       \