diff -r d60ef141e090 Modules/_randommodule.c
--- a/Modules/_randommodule.c	Wed Apr 11 20:38:45 2012 -0400
+++ b/Modules/_randommodule.c	Mon Apr 16 13:52:40 2012 +0300
@@ -427,8 +427,10 @@
         mt[j] = tmp;
     }
 
-    for (i = 0; i < N; i++)
+    for (i = 0; i < N; i++) {
         mt[i] += i+1;
+        mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
+    }
 
     self->index = N;
     Py_INCREF(Py_None);