Index: Objects/unicodeobject.c
===================================================================
--- Objects/unicodeobject.c	(revision 67068)
+++ Objects/unicodeobject.c	(working copy)
@@ -2843,10 +2843,13 @@
     return (PyObject *)v;
 
 ucnhashError:
-    PyErr_SetString(
-        PyExc_UnicodeError,
+    Py_XDECREF(exc);
+    exc = PyUnicodeDecodeError_Create(
+        "unicodeescape", starts, size, startinpos, endinpos,
         "\\N escapes not supported (can't load unicodedata module)"
         );
+    if (exc)
+        PyErr_SetObject(PyExc_UnicodeDecodeError, exc);
     Py_XDECREF(v);
     Py_XDECREF(errorHandler);
     Py_XDECREF(exc);