--- a/hgext3rd/evolve/stablerange.py	Sat Dec 09 06:13:28 2017 +0100
+++ b/hgext3rd/evolve/stablerange.py	Wed Nov 22 16:57:07 2017 +0100
@@ -29,10 +29,12 @@
 from mercurial.i18n import _
 
 from . import (
+    depthcache,
     exthelper,
 )
 
 eh = exthelper.exthelper()
+eh.merge(depthcache.eh)
 
 # prior to hg-4.2 there are not util.timer
 if util.safehasattr(util, 'timer'):