diff --git a/stdlib/3/http/client.pyi b/stdlib/3/http/client.pyi
index 79170ce2c..34402e40b 100644
--- a/stdlib/3/http/client.pyi
+++ b/stdlib/3/http/client.pyi
@@ -8,6 +8,7 @@ from typing import (
     IO,
     Any,
     BinaryIO,
+    Callable,
     Dict,
     Iterable,
     Iterator,
@@ -90,6 +91,8 @@ responses: Dict[int, str]
 
 class HTTPMessage(email.message.Message): ...
 
+def parse_headers(fp: io.BufferedIOBase, _class: Callable[[], email.message.Message] = ...) -> HTTPMessage: ...
+
 class HTTPResponse(io.BufferedIOBase, BinaryIO):
     msg: HTTPMessage
     headers: HTTPMessage