diff --git a/src/pip/_internal/network/xmlrpc.py b/src/pip/_internal/network/xmlrpc.py
index 8e360cc0f..beab4fcfa 100644
--- a/src/pip/_internal/network/xmlrpc.py
+++ b/src/pip/_internal/network/xmlrpc.py
@@ -12,7 +12,7 @@ from pip._vendor.six.moves.urllib import parse as urllib_parse
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
 
 if MYPY_CHECK_RUNNING:
-    from typing import Optional, Dict
+    from typing import Dict
     from pip._internal.network.session import PipSession
 
 logger = logging.getLogger(__name__)
@@ -24,14 +24,14 @@ class PipXmlrpcTransport(xmlrpc_client.Transport):
     """
 
     def __init__(self, index_url, session, use_datetime=False):
-        # type: (str, PipSession, Optional[bool]) -> None
+        # type: (str, PipSession, bool) -> None
         xmlrpc_client.Transport.__init__(self, use_datetime)
         index_parts = urllib_parse.urlparse(index_url)
         self._scheme = index_parts.scheme
         self._session = session
 
     def request(self, host, handler, request_body, verbose=False):
-        # type: (str, str, Dict[str, str], Optional[bool]) -> None
+        # type: (str, str, Dict[str, str], bool) -> None
         parts = (self._scheme, host, handler, None, None, None)
         url = urllib_parse.urlunparse(parts)
         try: