diff --git a/prompt_toolkit/eventloop/inputhook.py b/prompt_toolkit/eventloop/inputhook.py
index a6757ee29..17162d785 100644
--- a/prompt_toolkit/eventloop/inputhook.py
+++ b/prompt_toolkit/eventloop/inputhook.py
@@ -26,6 +26,7 @@
 import os
 import select
 import selectors
+import sys
 import threading
 from asyncio import AbstractEventLoop, get_event_loop
 from selectors import BaseSelector
@@ -41,6 +42,12 @@
 ]
 
 
+# Fix for https://github.com/prompt-toolkit/python-prompt-toolkit/issues/1433
+# As documented at https://github.com/encode/httpx/issues/914#issuecomment-622586610
+if sys.version_info[0] == 3 and sys.version_info[1] >= 8 and sys.platform.startswith('win'):
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
+
 def new_eventloop_with_inputhook(
     inputhook: Callable[["InputHookContext"], None]
 ) -> AbstractEventLoop: