diff --git a/stdlib/3/json.pyi b/stdlib/3/json.pyi
index d73245a9b..6accc80ff 100644
--- a/stdlib/3/json.pyi
+++ b/stdlib/3/json.pyi
@@ -34,7 +34,7 @@ def dump(obj: Any,
 def loads(s: str,
     encoding: Any = ..., # ignored and deprecated
     cls: Any = ...,
-    object_hook: Callable[[Dict], Any] = ...,
+    object_hook: Optional[Callable[[Dict], Any]] = ...,
     parse_float: Optional[Callable[[str], Any]] = ...,
     parse_int: Optional[Callable[[str], Any]] = ...,
     parse_constant: Optional[Callable[[str], Any]] = ...,
@@ -43,7 +43,7 @@ def loads(s: str,
 
 def load(fp: IO[str],
     cls: Any = ...,
-    object_hook: Callable[[Dict], Any] = ...,
+    object_hook: Optional[Callable[[Dict], Any]] = ...,
     parse_float: Optional[Callable[[str], Any]] = ...,
     parse_int: Optional[Callable[[str], Any]] = ...,
     parse_constant: Optional[Callable[[str], Any]] = ...,