diff --git a/hgext/histedit.py b/hgext/histedit.py
--- a/hgext/histedit.py
+++ b/hgext/histedit.py
@@ -1200,7 +1200,7 @@ def _aborthistedit(ui, repo, state):
             with repo.transaction('histedit.abort') as tr:
                 if not isinstance(gen, bundle2.unbundle20):
                     gen.apply(repo, 'histedit', 'bundle:' + backupfile)
-                if isinstance(gen, bundle2.unbundle20):
+                else:
                     bundle2.applybundle(repo, gen, tr,
                                         source='histedit',
                                         url='bundle:' + backupfile)
diff --git a/hgext/shelve.py b/hgext/shelve.py
--- a/hgext/shelve.py
+++ b/hgext/shelve.py
@@ -130,7 +130,7 @@ class shelvedfile(object):
                 gen.apply(self.repo, 'unshelve',
                           'bundle:' + self.vfs.join(self.fname),
                           targetphase=phases.secret)
-            if isinstance(gen, bundle2.unbundle20):
+            else:
                 bundle2.applybundle(self.repo, gen,
                                     self.repo.currenttransaction(),
                                     source='unshelve',