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-rw-r--r--sphinx/util/images.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/util/images.py b/sphinx/util/images.py
index 115007d31..0ddf64908 100644
--- a/sphinx/util/images.py
+++ b/sphinx/util/images.py
@@ -54,7 +54,7 @@ def get_image_size(filename: str) -> Optional[Tuple[int, int]]:
def guess_mimetype_for_stream(stream: IO, default: Optional[str] = None) -> Optional[str]:
- imgtype = imghdr.what(stream) # type: ignore
+ imgtype = imghdr.what(stream)
if imgtype:
return 'image/' + imgtype
else: