diff --git a/src/calibre/gui2/preferences/search.py b/src/calibre/gui2/preferences/search.py
index b0750d8049..092eddd02f 100644
--- a/src/calibre/gui2/preferences/search.py
+++ b/src/calibre/gui2/preferences/search.py
@@ -231,6 +231,7 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         return ConfigWidgetBase.commit(self)
 
     def refresh_gui(self, gui):
+        gui.current_db.new_api.clear_caches()
         set_use_primary_find_in_search(prefs['use_primary_find_in_search'])
         gui.set_highlight_only_button_icon()
         if self.muc_changed: