diff --git a/src/calibre/gui2/tweak_book/search.py b/src/calibre/gui2/tweak_book/search.py
index 351ef2270d..9da14cacea 100644
--- a/src/calibre/gui2/tweak_book/search.py
+++ b/src/calibre/gui2/tweak_book/search.py
@@ -1471,7 +1471,7 @@ def run_search(
             if show_diff and count > 0:
                 d = MessageBox(MessageBox.INFO, _('Searching done'), prepare_string_for_xml(msg), parent=gui_parent, show_copy_button=False, det_msg=det_msg)
                 d.diffb = b = d.bb.addButton(_('See what &changed'), d.bb.ActionRole)
-                b.setIcon(QIcon(I('diff.png'))), d.set_details(None), b.clicked.connect(d.accept)
+                b.setIcon(QIcon(I('diff.png'))), b.clicked.connect(d.accept)
                 b.clicked.connect(partial(show_current_diff, allow_revert=True), type=Qt.QueuedConnection)
                 d.exec_()
             else: