diff -r 6f6c87888b22 -r 8fb5212652ec hgdemandimport/demandimportpy2.py
--- a/hgdemandimport/demandimportpy2.py	Tue Aug 15 10:15:31 2017 -0700
+++ b/hgdemandimport/demandimportpy2.py	Fri Aug 18 11:08:17 2017 -0700
@@ -28,7 +28,6 @@
 
 import __builtin__ as builtins
 import contextlib
-import os
 import sys
 
 contextmanager = contextlib.contextmanager
@@ -285,8 +284,7 @@
 
 def enable():
     "enable global demand-loading of modules"
-    if os.environ.get('HGDEMANDIMPORT') != 'disable':
-        builtins.__import__ = _demandimport
+    builtins.__import__ = _demandimport
 
 def disable():
     "disable global demand-loading of modules"