diff --git a/Lib/socket.py b/Lib/socket.py
index 3073c012b19..6eb24acdb5c 100644
--- a/Lib/socket.py
+++ b/Lib/socket.py
@@ -416,6 +416,7 @@ def _sendfile_zerocopy(self, zerocopy_func, giveup_exc_type, file,
                     total_sent += sent
             return total_sent
         finally:
+            selector.close()
             if total_sent > 0 and hasattr(file, 'seek'):
                 file.seek(offset)