diff --git a/apps/search_indexes/filters.py b/apps/search_indexes/filters.py
index 5966d540..a2a1bd08 100644
--- a/apps/search_indexes/filters.py
+++ b/apps/search_indexes/filters.py
@@ -32,7 +32,8 @@ class CustomFacetedSearchFilterBackend(FacetedSearchFilterBackend):
                     'global'
                 ).bucket(__field, agg)
             else:
-                qs = queryset._clone()
+                qs = queryset.__copy__()
+                qs.query = queryset.query._clone()
                 filterer = makefilter(__facet)
                 qs.query._proxied._params['must'] = list(filter(filterer, qs.query._proxied._params['must']))
                 facet_name = '_filter_' + __field