diff -r ab3432a81c26 Lib/test/string_tests.py
--- a/Lib/test/string_tests.py	Sun Aug 14 08:28:57 2011 +0300
+++ b/Lib/test/string_tests.py	Sun Aug 14 20:56:03 2011 +0300
@@ -641,6 +641,22 @@
 self.checkequal('Aaaa', 'aaaa', 'capitalize')
 self.checkequal('Aaaa', 'AaAa', 'capitalize')
 
+ # check that title-cased chars are lowered correctly
+ self.checkequal('\u1ffc\u1ff3\u1ff3\u1ff3',
+ '\u1ff3\u1ff3\u1ffc\u1ffc', 'capitalize')
+ # check with non-letter chars
+ self.checkequal('\u24c5\u24e8\u24e3\u24d7\u24de\u24dd',
+ '\u24c5\u24ce\u24c9\u24bd\u24c4\u24c3', 'capitalize')
+ self.checkequal('\u24c5\u24e8\u24e3\u24d7\u24de\u24dd',
+ '\u24df\u24e8\u24e3\u24d7\u24de\u24dd', 'capitalize')
+ self.checkequal('\u2160\u2171\u2172',
+ '\u2160\u2161\u2162', 'capitalize')
+ self.checkequal('\u2160\u2171\u2172',
+ '\u2170\u2171\u2172', 'capitalize')
+ # check with Ll chars with no upper
+ self.checkequal('\u019b\u1d00\u1d86\u0221\u1fb7',
+ '\u019b\u1d00\u1d86\u0221\u1fb7', 'capitalize')
+
 self.checkraises(TypeError, 'hello', 'capitalize', 42)
 
 def test_lower(self):
diff -r ab3432a81c26 Objects/unicodeobject.c
--- a/Objects/unicodeobject.c	Sun Aug 14 08:28:57 2011 +0300
+++ b/Objects/unicodeobject.c	Sun Aug 14 20:56:03 2011 +0300
@@ -6658,13 +6658,13 @@
 
 if (len == 0)
 return 0;
- if (Py_UNICODE_ISLOWER(*s)) {
+ if (!Py_UNICODE_ISUPPER(*s)) {
 *s = Py_UNICODE_TOUPPER(*s);
 status = 1;
 }
 s++;
 while (--len> 0) {
- if (Py_UNICODE_ISUPPER(*s)) {
+ if (!Py_UNICODE_ISLOWER(*s)) {
 *s = Py_UNICODE_TOLOWER(*s);
 status = 1;
 }
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