--- Libc/Libc-825.26/stdio/FreeBSD/mktemp.c
+++ Libc/Libc-763.12/stdio/FreeBSD/mktemp.c
@@ -49,7 +49,7 @@
 
 static int _gettemp(char *, int *, int, int);
 
-static const char padchar[] =
+static const unsigned char padchar[] =
 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
 
 int