1 files changed, 2 insertions, 2 deletions
diff --git a/sphinx/io.py b/sphinx/io.py
index 8f1da22bd..88fee462f 100644
--- a/sphinx/io.py
+++ b/sphinx/io.py
@@ -10,6 +10,7 @@
 """
 import codecs
 import re
+from typing import TYPE_CHECKING
 
 from docutils.core import Publisher
 from docutils.io import FileInput, NullOutput
@@ -33,8 +34,7 @@ from sphinx.transforms.i18n import (
 from sphinx.util import logging
 from sphinx.util.docutils import LoggingReporter
 
-if False:
-    # For type annotation
+if TYPE_CHECKING:
     from typing import Any, Dict, List, Tuple, Union  # NOQA
     from docutils import nodes  # NOQA
     from docutils.io import Input  # NOQA