commit 9e9cf47c81dc3ecae451b4224168ca6bab2cf701
Author: Armin Ronacher <armin.ronacher@active-4.com>
Date:   Sun Sep 16 08:26:31 2012 +0900

    Added filesize part to the module compiler.  This fixes #131 for 3.3 and later

diff --git a/jinja2/environment.py b/jinja2/environment.py
index ebb5454..130f9a1 100644
--- a/jinja2/environment.py
+++ b/jinja2/environment.py
@@ -570,6 +570,10 @@ class Environment(object):
             py_header = imp.get_magic() + \
                 u'\xff\xff\xff\xff'.encode('iso-8859-15')
 
+            # Python 3.3 added a source filesize to the header
+            if sys.version_info >= (3, 3):
+                py_header += '\x00\x00\x00\x00'
+
         def write_file(filename, data, mode):
             if zip:
                 info = ZipInfo(filename)