diff --git a/apps/common/drf/filters.py b/apps/common/drf/filters.py
index 103eef212..0fb8ca63a 100644
--- a/apps/common/drf/filters.py
+++ b/apps/common/drf/filters.py
@@ -223,7 +223,7 @@ class LabelFilterBackend(filters.BaseFilterBackend):
             return queryset
 
         model = queryset.model
-        labeled_resource_cls = model.labels.field.related_model
+        labeled_resource_cls = model._labels.field.related_model
         app_label = model._meta.app_label
         model_name = model._meta.model_name
 
diff --git a/apps/labels/const.py b/apps/labels/const.py
index bf77ed46b..108b07df0 100644
--- a/apps/labels/const.py
+++ b/apps/labels/const.py
@@ -5,6 +5,7 @@ class LabeledResourceType(LazyObject):
     @staticmethod
     def get_res_types():
         from rbac.models import ContentType
+        from .mixins import LabeledMixin
         content_types = ContentType.objects.all()
         ids = []
         for ct in content_types:
@@ -13,7 +14,7 @@ class LabeledResourceType(LazyObject):
                 continue
             if model_cls._meta.parents:
                 continue
-            if 'labels' in model_cls._meta._forward_fields_map.keys():
+            if issubclass(model_cls, LabeledMixin):
                 ids.append(ct.id)
         return ContentType.objects.filter(id__in=ids)