diff --git a/django-stubs/db/models/fields/related.pyi b/django-stubs/db/models/fields/related.pyi
index aab35fb..3aa70da 100644
--- a/django-stubs/db/models/fields/related.pyi
+++ b/django-stubs/db/models/fields/related.pyi
@@ -114,7 +114,7 @@ class ForeignKey(ForeignObject[_ST, _GT]):
         to: Union[Type[Model], str],
         on_delete: Callable[..., None],
         to_field: Optional[str] = ...,
-        related_name: str = ...,
+        related_name: Optional[str] = ...,
         related_query_name: Optional[str] = ...,
         limit_choices_to: Optional[Union[Dict[str, Any], Callable[[], Any], Q]] = ...,
         parent_link: bool = ...,
@@ -159,7 +159,7 @@ class OneToOneField(RelatedField[_ST, _GT]):
         to: Union[Type[Model], str],
         on_delete: Any,
         to_field: Optional[str] = ...,
-        related_name: str = ...,
+        related_name: Optional[str] = ...,
         related_query_name: Optional[str] = ...,
         limit_choices_to: Optional[Union[Dict[str, Any], Callable[[], Any], Q]] = ...,
         parent_link: bool = ...,