diff --git a/bob/io/base/test_hdf5.py b/bob/io/base/test_hdf5.py
index 67515049b27ac965d3b56d84d7f81050e0022fae..0c12f2b7407be074af4df9efaaf1bfa325fce235 100644
--- a/bob/io/base/test_hdf5.py
+++ b/bob/io/base/test_hdf5.py
@@ -477,6 +477,7 @@ def test_copy_constructor():
 
     assert shallow.has_group("/Test")
     assert shallow.has_key("/Test/Data")
+    assert "/Test/Data" in shallow
     assert hdf5.filename == shallow.filename
     assert hdf5.keys() == shallow.keys()
     assert hdf5.cwd == shallow.cwd