diff --git a/Lib/email/Generator.py b/Lib/email/Generator.py
index 6f17963..3e578a2 100644
--- a/Lib/email/Generator.py
+++ b/Lib/email/Generator.py
@@ -363,7 +363,7 @@
 def _make_boundary(text=None):
     # Craft a random boundary.  If text is given, ensure that the chosen
     # boundary doesn't appear in the text.
-    token = random.randint(0, sys.maxint-1)
+    token = random.randrange(sys.maxint)
     boundary = ('=' * 15) + (_fmt % token) + '=='
     if text is None:
         return boundary