diff --git a/djadmin2/filters.py b/djadmin2/filters.py
index 73234b6..fc87cfb 100644
--- a/djadmin2/filters.py
+++ b/djadmin2/filters.py
@@ -135,7 +135,7 @@ def get_filter_for_field_name(model, field_name):
         django_filters.filterset.get_model_field(model, field_name,),
         field_name,
     )
-    filter_.extra = FILTER_TYPE_TO_WIDGET.get(
+    filter_.widget = FILTER_TYPE_TO_WIDGET.get(
         filter_.__class__,
         filter_.widget,
     )
diff --git a/example/blog/tests/test_filters.py b/example/blog/tests/test_filters.py
index de609f1..ffac928 100644
--- a/example/blog/tests/test_filters.py
+++ b/example/blog/tests/test_filters.py
@@ -45,7 +45,7 @@ class ListFilterBuilderTest(TestCase):
             issubclass(list_filter_inst.__class__, django_filters.FilterSet)
         )
         self.assertEqual(
-            list_filter_inst.filters['published'].extra['widget'],
+            list_filter_inst.filters['published'].widget,
             djadmin2_filters.NullBooleanLinksWidget,
         )
         list_filter_inst = djadmin2_filters.build_list_filter(
@@ -54,7 +54,7 @@ class ListFilterBuilderTest(TestCase):
             Post.objects.all(),
         )
         self.assertNotEqual(
-            list_filter_inst.filters['published'].extra['widget'],
+            list_filter_inst.filters['published'].widget,
             djadmin2_filters.NullBooleanLinksWidget,
         )
         list_filter_inst = djadmin2_filters.build_list_filter(