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-rw-r--r--sphinx/util/png.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/sphinx/util/png.py b/sphinx/util/png.py
index cb7ee8be4..d2718da18 100644
--- a/sphinx/util/png.py
+++ b/sphinx/util/png.py
@@ -1,5 +1,7 @@
"""PNG image manipulation helpers."""
+from __future__ import annotations
+
import binascii
import struct
from typing import Optional