--- parser3/src/lib/punycode/pa_punycode.c	2015/09/28 22:19:25	1.2
+++ parser3/src/lib/punycode/pa_punycode.c	2015/10/12 21:01:14	1.4
@@ -109,7 +109,7 @@ static char encode_digit (punycode_uint
 /* (uppercase).  The behavior is undefined if bcp is not a  */
 /* basic code point.                                        */
 
-#define flagged(bcp) ((punycode_uint)(bcp) - 65 < 26)
+#define flagged(bcp) (unsigned char)((punycode_uint)(bcp) - 65 < 26)
 
 /* encode_basic(bcp,flag) forces a basic code point to lowercase */
 /* if flag is zero, uppercase if flag is nonzero, and returns    */