diff -r 1787277915e9 Objects/unicodeobject.c
--- a/Objects/unicodeobject.c	Wed Oct 30 00:04:59 2013 +0100
+++ b/Objects/unicodeobject.c	Wed Oct 30 10:19:14 2013 +0800
@@ -10580,7 +10580,7 @@
         return -1;
     kind = PyUnicode_KIND(uni);
     if (kind == PyUnicode_1BYTE_KIND) {
-        char *data = PyUnicode_1BYTE_DATA(uni);
+        unsigned char *data = PyUnicode_1BYTE_DATA(uni);
         Py_ssize_t len1 = PyUnicode_GET_LENGTH(uni);
         size_t len, len2 = strlen(str);
         int cmp;