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2 changes: 1 addition & 1 deletion src/docx/package.py
Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ def _next_image_partname(self, ext: str) -> PackURI:
def image_partname(n: int) -> PackURI:
return PackURI("/word/media/image%d.%s" % (n, ext))

used_numbers = [image_part.partname.idx for image_part in self]
used_numbers = {image_part.partname.idx for image_part in self}
for n in range(1, len(self) + 1):
if n not in used_numbers:
return image_partname(n)
Expand Down