diff --git a/django-stubs/conf/urls/__init__.pyi b/django-stubs/conf/urls/__init__.pyi
index 6bb0dfa..71d290b 100644
--- a/django-stubs/conf/urls/__init__.pyi
+++ b/django-stubs/conf/urls/__init__.pyi
@@ -5,10 +5,10 @@ from django.http.response import HttpResponse, HttpResponseBase
 
 from django.urls import URLResolver, URLPattern
 
-handler400: Callable[..., HttpResponse] = ...
-handler403: Callable[..., HttpResponse] = ...
-handler404: Callable[..., HttpResponse] = ...
-handler500: Callable[..., HttpResponse] = ...
+handler400: Union[str, Callable[..., HttpResponse]] = ...
+handler403: Union[str, Callable[..., HttpResponse]] = ...
+handler404: Union[str, Callable[..., HttpResponse]] = ...
+handler500: Union[str, Callable[..., HttpResponse]] = ...
 
 IncludedURLConf = Tuple[List[URLResolver], Optional[str], Optional[str]]