diff -r d866bbdd68e8 Objects/unicodeobject.c
--- a/Objects/unicodeobject.c	Tue Jan 15 16:49:35 2013 -0500
+++ b/Objects/unicodeobject.c	Wed Jan 16 16:43:26 2013 +0200
@@ -5597,7 +5597,7 @@
             }
             else {
                 WRITECHAR('\\');
-                WRITECHAR(s[-1]);
+                WRITECHAR((unsigned char)s[-1]);
             }
             break;
         }