diff --git a/stubs/oauthlib/@tests/test_cases/check_oauth2_clients.py b/stubs/oauthlib/@tests/test_cases/check_oauth2_clients.py
new file mode 100644
index 000000000000..4948d6221e43
--- /dev/null
+++ b/stubs/oauthlib/@tests/test_cases/check_oauth2_clients.py
@@ -0,0 +1,13 @@
+from typing_extensions import assert_type
+
+from oauthlib.oauth2 import LegacyApplicationClient, OAuth2Token
+
+client = LegacyApplicationClient("client-id")
+
+assert_type(
+    client.prepare_request_body(
+        username="username", password="password", scope="read write", include_client_id=True, response_type="token"
+    ),
+    str,
+)
+assert_type(client.parse_request_body_response('{"access_token": "token"}'), OAuth2Token)
diff --git a/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/base.pyi b/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/base.pyi
index aa5cf71e7aa0..2ffb7868ec89 100644
--- a/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/base.pyi
+++ b/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/base.pyi
@@ -106,7 +106,7 @@ class Client:
         **kwargs,
     ): ...
     def parse_request_body_response(
-        self, body: str, scope: str | set[object] | tuple[object] | list[object] | None = None, **kwargs
+        self, body: str, scope: str | set[object] | tuple[object] | list[object] | None = None, **kwargs: object
     ) -> OAuth2Token: ...
     def prepare_refresh_body(
         self,
diff --git a/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/legacy_application.pyi b/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/legacy_application.pyi
index 9fe5fd41d0ff..ef24609c5a71 100644
--- a/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/legacy_application.pyi
+++ b/stubs/oauthlib/oauthlib/oauth2/rfc6749/clients/legacy_application.pyi
@@ -38,5 +38,5 @@ class LegacyApplicationClient(Client):
         client_secret: str | None = None,
         code: str | None = None,
         redirect_uri: str | None = None,
-        **kwargs,
+        **kwargs: object,
     ) -> str: ...