diff --git a/gramps/gui/plug/_guioptions.py b/gramps/gui/plug/_guioptions.py
index 3f6248df1..15a3dfd64 100644
--- a/gramps/gui/plug/_guioptions.py
+++ b/gramps/gui/plug/_guioptions.py
@@ -60,7 +60,8 @@ from ..dialog import OptionDialog
 from ..selectors import SelectorFactory
 from gramps.gen.display.name import displayer as _nd
 from gramps.gen.filters import GenericFilterFactory, GenericFilter, rules
-from gramps.gen.constfunc import conv_to_unicode, uni_to_gui, get_curr_dir
+from gramps.gen.constfunc import (conv_to_unicode, uni_to_gui, get_curr_dir,
+                                  STRTYPE, cuni)
 from gramps.gen.const import GRAMPS_LOCALE as glocale
 _ = glocale.translation.gettext