--- a/setup.py
+++ b/setup.py
@@ -14,6 +14,8 @@ from distutils.core import setup, Extens
 from distutils.command.install_data import install_data
 
 import mercurial.version
+import mercurial.demandimport
+mercurial.demandimport.enable = lambda: None
 
 # py2exe needs to be installed to work
 try: