diff --git a/src/mods4pandas/tests/test_mods4pandas.py b/src/mods4pandas/tests/test_mods4pandas.py
index 57e20a9..e6e402d 100644
--- a/src/mods4pandas/tests/test_mods4pandas.py
+++ b/src/mods4pandas/tests/test_mods4pandas.py
@@ -204,6 +204,9 @@ def test_dtypes(tmp_path):
     EXPECTED_TYPES = {
         # mods_info
         r"mets_file": ("object", ["str"]),
+        r"(recordInfo_)?recordIdentifier.*": ("object", ["str"]),
+        r"ppn": ("object", ["str"]),
+        r"ID": ("object", ["str"]),
         r"titleInfo_title": ("object", ["str"]),
         r"titleInfo_subTitle": ("object", ["str", "NoneType"]),
         r"titleInfo_partName": ("object", ["str", "NoneType"]),