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-rw-r--r--sphinx/ext/mathbase.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/sphinx/ext/mathbase.py b/sphinx/ext/mathbase.py
index 076edaf37..185e35956 100644
--- a/sphinx/ext/mathbase.py
+++ b/sphinx/ext/mathbase.py
@@ -26,6 +26,7 @@ if False:
from typing import Any, Callable, List, Tuple # NOQA
from docutils.writers.html4css1 import Writer # NOQA
from sphinx.application import Sphinx # NOQA
+ from sphinx.util.typing import unicode # NOQA
class MathDirective(MathDirectiveBase):