diff --git a/Lib/asyncio/selector_events.py b/Lib/asyncio/selector_events.py
index 59cb6b1bab..c124fa8574 100644
--- a/Lib/asyncio/selector_events.py
+++ b/Lib/asyncio/selector_events.py
@@ -159,7 +159,7 @@ def _accept_connection(
         # listening socket has triggered an EVENT_READ. There may be multiple
         # connections waiting for an .accept() so it is called in a loop.
         # See https://bugs.python.org/issue27906 for more details.
-        for _ in range(backlog):
+        for _ in range(backlog + 1):
             try:
                 conn, addr = sock.accept()
                 if self._debug:
diff --git a/Lib/test/test_asyncio/test_selector_events.py b/Lib/test/test_asyncio/test_selector_events.py
index b684fab277..a3efa838e2 100644
--- a/Lib/test/test_asyncio/test_selector_events.py
+++ b/Lib/test/test_asyncio/test_selector_events.py
@@ -374,7 +374,7 @@ def test_accept_connection_multiple(self):
             self.loop._accept_connection(
                 mock.Mock(), sock, backlog=backlog)
         self.loop.run_until_complete(asyncio.sleep(0))
-        self.assertEqual(sock.accept.call_count, backlog)
+        self.assertEqual(sock.accept.call_count, backlog + 1)
 
 
 class SelectorTransportTests(test_utils.TestCase):