--- a/mercurial/demandimport.py	Sat Feb 06 19:09:10 2016 +0900
+++ b/mercurial/demandimport.py	Sat Feb 06 19:16:12 2016 +0900
@@ -255,6 +255,7 @@
     '_sre', # issue4920
     'rfc822',
     'mimetools',
+    'sqlalchemy.events', # has import-time side effects (issue5085)
     # setuptools 8 expects this module to explode early when not on windows
     'distutils.msvc9compiler'
     ]