--- Objects/longobject.c.orig	2015-09-24 01:46:12.551309822 +0900
+++ Objects/longobject.c	2015-09-24 01:43:34.063231227 +0900
@@ -241,14 +241,15 @@
     if (ival < 0) {
         /* negate: can't write this as abs_ival = -ival since that
            invokes undefined behaviour when ival is LONG_MIN */
         abs_ival = 0U-(unsigned long)ival;
         sign = -1;
     }
     else {
+        if(ival == 0) sign = 0;
         abs_ival = (unsigned long)ival;
     }
 
     /* Fast path for single-digit ints */
     if (!(abs_ival >> PyLong_SHIFT)) {
         v = _PyLong_New(1);
         if (v) {