--- JSON-XS/XS.xs	2009/09/05 23:00:56	1.100
+++ JSON-XS/XS.xs	2009/10/10 01:48:50	1.102
@@ -19,7 +19,8 @@
 # define UTF8_MAXBYTES 13
 #endif
 
-#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 2)
+// three extra for rounding, sign, and end of string
+#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
 
 #define F_ASCII          0x00000001UL
 #define F_LATIN1         0x00000002UL
@@ -951,11 +952,10 @@
           else if (ch >= 0x80)
             {
               STRLEN clen;
-              UV uch;
 
               --dec_cur;
 
-              uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
+              decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
               if (clen == (STRLEN)-1)
                 ERR ("malformed UTF-8 character in JSON string");