diff --git a/gramps/gen/filters/__init__.py b/gramps/gen/filters/__init__.py
index eecfc60b2..baea6bd32 100644
--- a/gramps/gen/filters/__init__.py
+++ b/gramps/gen/filters/__init__.py
@@ -27,7 +27,7 @@ CustomFilters = None
 
 from ..const import CUSTOM_FILTERS
 from ._filterlist import FilterList
-from ._genericfilter import GenericFilter, GenericFilterFactory
+from ._genericfilter import GenericFilter, GenericFilterFactory, DeferredFilter
 from ._paramfilter import ParamFilter
 from ._searchfilter import SearchFilter, ExactSearchFilter