diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index f813ece..220d6e1 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -264,8 +264,10 @@
         try:
             self.sock.shutdown(socket.SHUT_RDWR)
         except socket.error as e:
-            # The server might already have closed the connection
-            if e.errno != errno.ENOTCONN:
+            # The server might already have closed the connection.
+            # On Windows, this may result in WSAEINVAL (error 10022):
+            # An invalid operation was attempted.
+            if e.errno not in (errno.ENOTCONN, 10022):
                 raise
         finally:
             self.sock.close()