diff --git a/nwb_linkml/tests/test_includes/test_hdmf.py b/nwb_linkml/tests/test_includes/test_hdmf.py
index 87e1c88..2b5d47f 100644
--- a/nwb_linkml/tests/test_includes/test_hdmf.py
+++ b/nwb_linkml/tests/test_includes/test_hdmf.py
@@ -213,7 +213,7 @@ def test_dynamictable_region_ragged():
     # 0   1  [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, ...
     # 1   2  [2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, ...
     # 2   3  [3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, 3.0, ...
-    assert rows.shape(3, 2)
+    assert rows.shape == (3, 2)
     assert all(rows.id == [1, 2, 3])
     assert all([all(row[1].timeseries == i) for i, row in zip([1, 2, 3], rows.iterrows())])