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-rw-r--r--sphinx/util/jsonimpl.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/sphinx/util/jsonimpl.py b/sphinx/util/jsonimpl.py
index e76ba6a0f..557bc122f 100644
--- a/sphinx/util/jsonimpl.py
+++ b/sphinx/util/jsonimpl.py
@@ -17,6 +17,7 @@ from six.moves import UserString
if False:
# For type annotation
from typing import Any, IO # NOQA
+ from sphinx.util.typing import unicode # NOQA
class SphinxJSONEncoder(json.JSONEncoder):