diff --git a/stdlib/3/io.pyi b/stdlib/3/io.pyi
index be70e5415..167385318 100644
--- a/stdlib/3/io.pyi
+++ b/stdlib/3/io.pyi
@@ -1,7 +1,7 @@
 # Stubs for io
 
 from typing import (
-    List, BinaryIO, TextIO, Iterator, Union, Optional, Callable, Tuple, Any, IO
+    List, BinaryIO, TextIO, Iterator, Union, Optional, Callable, Tuple, Any, IO, Iterable
 )
 import builtins
 import codecs
@@ -47,7 +47,7 @@ class IOBase:
     def tell(self) -> int: ...
     def truncate(self, size: Optional[int] = ...) -> int: ...
     def writable(self) -> bool: ...
-    def writelines(self, lines: List[Union[bytes, bytearray]]) -> None: ...
+    def writelines(self, lines: Iterable[Union[bytes, bytearray]]) -> None: ...
     if sys.version_info >= (3, 4):
         def readline(self, size: int = ...) -> bytes: ...
         def __del__(self) -> None: ...