diff --git a/Tests/test_file_tiff_metadata.py b/Tests/test_file_tiff_metadata.py
index 0f7f8adf1..af7528be0 100644
--- a/Tests/test_file_tiff_metadata.py
+++ b/Tests/test_file_tiff_metadata.py
@@ -179,6 +179,12 @@ def test_no_duplicate_50741_tag():
     assert TAG_IDS["BestQualityScale"] == 50780
 
 
+def test_iptc(tmp_path):
+    out = str(tmp_path / "temp.tiff")
+    with Image.open("Tests/images/hopper.Lab.tif") as im:
+        im.save(out)
+
+
 def test_empty_metadata():
     f = io.BytesIO(b"II*\x00\x08\x00\x00\x00")
     head = f.read(8)
diff --git a/src/PIL/TiffTags.py b/src/PIL/TiffTags.py
index 088272162..d7f732193 100644
--- a/src/PIL/TiffTags.py
+++ b/src/PIL/TiffTags.py
@@ -178,7 +178,7 @@ TAGS_V2 = {
     532: ("ReferenceBlackWhite", RATIONAL, 6),
     700: ("XMP", BYTE, 0),
     33432: ("Copyright", ASCII, 1),
-    33723: ("IptcNaaInfo", UNDEFINED, 0),
+    33723: ("IptcNaaInfo", UNDEFINED, 1),
     34377: ("PhotoshopInfo", BYTE, 0),
     # FIXME add more tags here
     34665: ("ExifIFD", LONG, 1),