diff --git a/hgext3rd/obsshelve.py b/hgext3rd/obsshelve.py
--- a/hgext3rd/obsshelve.py
+++ b/hgext3rd/obsshelve.py
@@ -423,9 +423,16 @@
     shelvedfile(repo, name, 'oshelve').writeobsshelveinfo({
         'node': nodemod.hex(node)
     })
-    cmdutil.export(repo.unfiltered(), [node],
-                   fp=shelvedfile(repo, name, patchextension).opener('wb'),
-                   opts=mdiff.diffopts(git=True))
+    if util.safehasattr(cmdutil, 'exportfile'):
+        # Mercurial 4.6 and later
+        cmdutil.exportfile(repo.unfiltered(), [node],
+                       shelvedfile(repo, name, patchextension).opener('wb'),
+                       opts=mdiff.diffopts(git=True))
+    else:
+        # Mercurial 4.5 and earlier
+        cmdutil.export(repo.unfiltered(), [node],
+                       fp=shelvedfile(repo, name, patchextension).opener('wb'),
+                       opts=mdiff.diffopts(git=True))
 
 def _includeunknownfiles(repo, pats, opts, extra):
     s = repo.status(match=scmutil.match(repo[None], pats, opts),