Index: Objects/exceptions.c
===================================================================
--- Objects/exceptions.c	(revision 76759)
+++ Objects/exceptions.c	(working copy)
@@ -1717,6 +1717,19 @@
     );
 }
 
+#ifdef Py_USING_UNICODE
+static PyObject *
+UnicodeDecodeError_unicode(PyObject *self)
+{
+    return PyObject_Unicode(UnicodeDecodeError_str(self));
+}
+
+static PyMethodDef UnicodeDecodeError_methods[] = {
+   {"__unicode__", (PyCFunction)UnicodeDecodeError_unicode, METH_NOARGS },
+};
+#endif
+
+
 static PyTypeObject _PyExc_UnicodeDecodeError = {
     PyObject_HEAD_INIT(NULL)
     0,
@@ -1726,7 +1739,13 @@
     (reprfunc)UnicodeDecodeError_str, 0, 0, 0,
     Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
     PyDoc_STR("Unicode decoding error."), (traverseproc)UnicodeError_traverse,
-    (inquiry)UnicodeError_clear, 0, 0, 0, 0, 0, UnicodeError_members,
+    (inquiry)UnicodeError_clear, 0, 0, 0, 0,
+#ifndef Py_USING_UNICODE
+    0,
+#else
+    UnicodeDecodeError_methods,
+#endif
+    UnicodeError_members,
     0, &_PyExc_UnicodeError, 0, 0, 0, offsetof(PyUnicodeErrorObject, dict),
     (initproc)UnicodeDecodeError_init, 0, BaseException_new,
 };