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-rw-r--r--sphinx/builders/htmlhelp.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/sphinx/builders/htmlhelp.py b/sphinx/builders/htmlhelp.py
index 252e5050d..ce8a8956f 100644
--- a/sphinx/builders/htmlhelp.py
+++ b/sphinx/builders/htmlhelp.py
@@ -29,6 +29,7 @@ if False:
# For type annotation
from typing import Any, Dict, IO, List, Tuple # NOQA
from sphinx.application import Sphinx # NOQA
+ from sphinx.util.typing import unicode # NOQA
logger = logging.getLogger(__name__)