diff --git a/rest_framework-stubs/test.pyi b/rest_framework-stubs/test.pyi
index b5dca1581..bec063896 100644
--- a/rest_framework-stubs/test.pyi
+++ b/rest_framework-stubs/test.pyi
@@ -73,7 +73,7 @@ class ForceAuthClientHandler(ClientHandler):
     def get_response(self, request: Request) -> _MonkeyPatchedResponse: ...  # type: ignore[override]
 
 class APIClient(APIRequestFactory, DjangoClient):
-    def credentials(self, **kwargs: Any): ...
+    def credentials(self, **kwargs: Any) -> None: ...
     def force_authenticate(
         self, user: AnonymousUser | AbstractBaseUser | None = ..., token: Token | None = ...
     ) -> None: ...