diff --git a/stdlib/3/inspect.pyi b/stdlib/3/inspect.pyi
index 099041551..975b47828 100644
--- a/stdlib/3/inspect.pyi
+++ b/stdlib/3/inspect.pyi
@@ -187,9 +187,9 @@ def getargspec(func: object) -> ArgSpec: ...
 FullArgSpec = NamedTuple('FullArgSpec', [('args', List[str]),
                                          ('varargs', Optional[str]),
                                          ('varkw', Optional[str]),
-                                         ('defaults', Tuple[Any, ...]),
+                                         ('defaults', Optional[Tuple[Any, ...]]),
                                          ('kwonlyargs', List[str]),
-                                         ('kwonlydefaults', Dict[str, Any]),
+                                         ('kwonlydefaults', Optional[Dict[str, Any]]),
                                          ('annotations', Dict[str, Any]),
                                          ])