diff -r 2ba6fa21303d Lib/site.py
--- a/Lib/site.py	Tue Jan 15 13:23:32 2013 +0000
+++ b/Lib/site.py	Tue Jan 15 16:19:16 2013 +0200
@@ -146,7 +146,7 @@
        and add that to known_paths, or execute it if it starts with 'import '.
     """
     if known_paths is None:
-        _init_pathinfo()
+        known_paths = _init_pathinfo()
         reset = 1
     else:
         reset = 0