diff --git a/stdlib/2/shutil.pyi b/stdlib/2/shutil.pyi
index a826a097b..c39f25780 100644
--- a/stdlib/2/shutil.pyi
+++ b/stdlib/2/shutil.pyi
@@ -2,7 +2,7 @@
 #
 # NOTE: Based on a dynamically typed stub automatically generated by stubgen.
 
-from typing import List, Iterable, Callable, IO, AnyStr, Any, Tuple, Sequence
+from typing import List, Iterable, Callable, IO, AnyStr, Any, Optional, Tuple, Sequence
 
 class Error(EnvironmentError): ...
 class SpecialFileError(EnvironmentError): ...
@@ -16,7 +16,7 @@ def copy(src: unicode, dst: unicode) -> None: ...
 def copy2(src: unicode, dst: unicode) -> None: ...
 def ignore_patterns(*patterns: AnyStr) -> Callable[[AnyStr, List[AnyStr]], Iterable[AnyStr]]: ...
 def copytree(src: AnyStr, dst: AnyStr, symlinks: bool = ...,
-             ignore: Callable[[AnyStr, List[AnyStr]], Iterable[AnyStr]] = ...) -> None: ...
+             ignore: Optional[Callable[[AnyStr, List[AnyStr]], Iterable[AnyStr]]] = ...) -> None: ...
 def rmtree(path: AnyStr, ignore_errors: bool = ...,
            onerror: Callable[[Any, AnyStr, Any], None] = ...) -> None: ...
 def move(src: unicode, dst: unicode) -> None: ...
diff --git a/stdlib/3/shutil.pyi b/stdlib/3/shutil.pyi
index c0745e368..d266bbee5 100644
--- a/stdlib/3/shutil.pyi
+++ b/stdlib/3/shutil.pyi
@@ -20,7 +20,7 @@ def copy2(src: str, dst: str) -> None: ...
 def ignore_patterns(*patterns: str) -> Callable[[str, List[str]],
                                                 Iterable[str]]: ...
 def copytree(src: str, dst: str, symlinks: bool = ...,
-             ignore: Callable[[str, List[str]], Iterable[str]] = ...,
+             ignore: Optional[Callable[[str, List[str]], Iterable[str]]] = ...,
              copy_function: Callable[[str, str], None] = ...,
              ignore_dangling_symlinks: bool = ...) -> None: ...
 def rmtree(path: str, ignore_errors: bool = ...,