--- mailmime_content.c.orig	2003-12-16 17:45:47.000000000 +0100
+++ mailmime_content.c	2003-12-16 17:45:55.000000000 +0100
@@ -1549,7 +1549,7 @@
 /* ************************************************************************* */
 /* MIME part decoding */
 
-static char get_base64_value(char ch)
+static signed char get_base64_value(char ch)
 {
   if ((ch >= 'A') && (ch <= 'Z'))
     return ch - 'A';
@@ -1595,7 +1595,7 @@
 
   i = 0;
   while (1) {
-    char value;
+    signed char value;
 
     value = -1;
     while (value == -1) {