diff --git a/src/calibre/ebooks/oeb/polish/container.py b/src/calibre/ebooks/oeb/polish/container.py
index 20d4996ee4..1568725479 100644
--- a/src/calibre/ebooks/oeb/polish/container.py
+++ b/src/calibre/ebooks/oeb/polish/container.py
@@ -326,7 +326,7 @@ class Container(ContainerBase):  # {{{
         }
 
     def clone_data(self, dest_dir):
-        Container.commit(self, keep_parsed=True)
+        Container.commit(self, keep_parsed=False)
         self.cloned = True
         clone_dir(self.root, dest_dir)
         return self.data_for_clone(dest_dir)