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-rw-r--r--sphinx/environment/adapters/indexentries.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/sphinx/environment/adapters/indexentries.py b/sphinx/environment/adapters/indexentries.py
index d39fb057d..5235ef706 100644
--- a/sphinx/environment/adapters/indexentries.py
+++ b/sphinx/environment/adapters/indexentries.py
@@ -23,6 +23,7 @@ if False:
from typing import Any, Dict, Pattern, List, Tuple # NOQA
from sphinx.builders import Builder # NOQA
from sphinx.environment import BuildEnvironment # NOQA
+ from sphinx.util.typing import unicode # NOQA
logger = logging.getLogger(__name__)