diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index 67c985b6fd..fc3f1cb08c 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -403,7 +403,8 @@ class Boss(QObject):
             except:
                 self.rewind_savepoint()
                 raise
-            self.apply_container_update_to_gui()
+            if changed:
+                self.apply_container_update_to_gui()
             from calibre.ebooks.markdown import markdown
             report = markdown('# %s\n\n'%self.current_metadata.title + '\n\n'.join(report), output_format='html4')
         if not changed: