diff -r d830d4e9f212 -r 777e5c369d99 hgext/pushexperiment.py
--- a/hgext/pushexperiment.py	Fri Jun 26 00:59:22 2015 -0700
+++ b/hgext/pushexperiment.py	Mon Jun 29 02:30:27 2015 -0700
@@ -80,7 +80,7 @@
         and remote.capable('_push_experiment_pushobsmarkers_0')):
         # push marker early to limit damage of pushing too early.
         try:
-            obsfp = repo.sopener('obsstore')
+            obsfp = repo.svfs('obsstore')
         except IOError as e:
             if e.errno != errno.ENOENT:
                 raise