diff --git a/src/calibre/gui2/tweak_book/check_links.py b/src/calibre/gui2/tweak_book/check_links.py
index c4e7be5f4e..94cd1bff67 100644
--- a/src/calibre/gui2/tweak_book/check_links.py
+++ b/src/calibre/gui2/tweak_book/check_links.py
@@ -105,7 +105,7 @@ class CheckExternalLinks(Dialog):
             self.rb.setEnabled(True)
             if self.tb is not None:
                 return error_dialog(self, _('Checking failed'), _(
-                    'There was an error while checking links, click "Show Details" for more information'),
+                    'There was an error while checking links, click "Show details" for more information'),
                              det_msg=self.tb, show=True)
             if not self.errors:
                 self.results.setText(_('No broken links found'))