diff --git a/stdlib/3/urllib/error.pyi b/stdlib/3/urllib/error.pyi
index 83dcf8f8d..926f32d03 100644
--- a/stdlib/3/urllib/error.pyi
+++ b/stdlib/3/urllib/error.pyi
@@ -1,4 +1,4 @@
-from typing import IO, Mapping, Union
+from typing import IO, Mapping, Optional, Union
 from urllib.response import addinfourl
 
 # Stubs for urllib.error
@@ -8,6 +8,6 @@ class URLError(IOError):
 
 class HTTPError(URLError, addinfourl):
     code: int
-    def __init__(self, url: str, code: int, msg: str, hdrs: Mapping[str, str], fp: IO[bytes]) -> None: ...
+    def __init__(self, url: str, code: int, msg: str, hdrs: Mapping[str, str], fp: Optional[IO[bytes]]) -> None: ...
 
 class ContentTooShortError(URLError): ...