diff --git a/src/calibre/gui2/tweak_book/ui.py b/src/calibre/gui2/tweak_book/ui.py
index ec0f27679c..1a2efd6e00 100644
--- a/src/calibre/gui2/tweak_book/ui.py
+++ b/src/calibre/gui2/tweak_book/ui.py
@@ -449,7 +449,7 @@ class Main(MainWindow):
             'edit-clear.png', _('&Close other tabs'), self.central.close_all_but_current_editor, 'close-all-but-current-tab', 'Ctrl+Alt+W', _(
                 'Close all tabs except the current tab'))
         self.action_help = treg(
-            'help.png', _('User &Manual'), lambda : open_url(localize_user_manual_link(QUrl(
+            'help.png', _('User &Manual'), lambda : open_url(QUrl(localize_user_manual_link(
                 'http://manual.calibre-ebook.com/edit.html'))), 'user-manual', 'F1', _(
                 'Show User Manual'))
         self.action_browse_images = treg(