diff --git a/stubs/simplejson/@tests/test_cases/check_simplejson.py b/stubs/simplejson/@tests/test_cases/check_simplejson.py
index c62fd73dad6e..7b2a6717a96f 100644
--- a/stubs/simplejson/@tests/test_cases/check_simplejson.py
+++ b/stubs/simplejson/@tests/test_cases/check_simplejson.py
@@ -1,8 +1,9 @@
 from __future__ import annotations
 
+from typing import Any
 from typing_extensions import assert_type
 
-from simplejson import JSONEncoder, dumps
+from simplejson import JSONDecoder, JSONEncoder, dumps
 
 
 class CustomEncoder(JSONEncoder):  # eventhough it does not have `extra_kw` arg.
@@ -14,3 +15,14 @@ class CustomEncoder(JSONEncoder):  # eventhough it does not have `extra_kw` arg.
 
 # Ok:
 assert_type(dumps([], cls=CustomEncoder, extra_kw=True), str)
+
+decoder = JSONDecoder()
+assert_type(decoder.scan_once("{}", 0), tuple[Any, int])
+assert_type(decoder.parse_string('"hello"', 1), tuple[str, int])
+assert_type(decoder.parse_array(("[]", 1), decoder.scan_once), tuple[Any, int])
+assert_type(
+    decoder.parse_object(
+        ("{}", 1), decoder.encoding, decoder.strict, decoder.scan_once, decoder.object_hook, decoder.object_pairs_hook
+    ),
+    tuple[Any, int],
+)
diff --git a/stubs/simplejson/simplejson/decoder.pyi b/stubs/simplejson/simplejson/decoder.pyi
index 3fc18bc176e5..b45e81919fd3 100644
--- a/stubs/simplejson/simplejson/decoder.pyi
+++ b/stubs/simplejson/simplejson/decoder.pyi
@@ -1,4 +1,3 @@
-from _typeshed import Incomplete
 from collections.abc import Callable
 from re import Match
 from typing import Any, Literal
@@ -14,11 +13,11 @@ class JSONDecoder:
     strict: bool
     array_hook: Callable[[list[Any]], Any] | None  # transforms a JSON value to an arbitrary value
     # They have many parameters, it might be better to use Protocol:
-    parse_object: Callable[..., tuple[Incomplete, int]]
-    parse_array: Callable[..., tuple[Incomplete, int]]
-    parse_string: Callable[..., tuple[Incomplete, int]]
+    parse_object: Callable[..., tuple[Any, int]]
+    parse_array: Callable[..., tuple[Any, int]]
+    parse_string: Callable[..., tuple[str, int]]
     memo: dict[Any, Any]
-    scan_once: Callable[[str, int], tuple[bool, int]]
+    scan_once: Callable[[str, int], tuple[Any, int]]
 
     def __init__(
         self,