diff --git a/drf_util/views.py b/drf_util/views.py
index e27c967..8fd1107 100644
--- a/drf_util/views.py
+++ b/drf_util/views.py
@@ -114,7 +114,8 @@ def get_queryset(self) -> QuerySet:
         return queryset
 
     def get_serializer_by_action(self):
-        return self.serializer_by_action.get(self.action)
+        return self.serializer_by_action.get(self.action) or getattr(self, f'serializer_{self.action}_class') \
+            if self.action in ['list', 'retrieve'] else None
 
     def get_serializer_class(self):
         return self.get_serializer_by_action() or super().get_serializer_class()