diff --git a/django-stubs/core/files/storage.pyi b/django-stubs/core/files/storage.pyi
index ae590cd..07ceccf 100644
--- a/django-stubs/core/files/storage.pyi
+++ b/django-stubs/core/files/storage.pyi
@@ -8,6 +8,7 @@ class Storage:
     def open(self, name: str, mode: str = ...) -> File: ...
     def save(self, name: Optional[str], content: IO[Any], max_length: Optional[int] = ...) -> str: ...
     def get_valid_name(self, name: str) -> str: ...
+    def get_alternative_name(self, file_root: str, file_ext: str) -> str: ...
     def get_available_name(self, name: str, max_length: Optional[int] = ...) -> str: ...
     def generate_filename(self, filename: str) -> str: ...
     def path(self, name: str) -> str: ...