diff --git a/bob/bio/csu/test/data/ldair_detected.hdf5 b/bob/bio/csu/test/data/ldair_detected.hdf5
index 4fd714031471954f33067cde7c14adaf0fdd49c5..0437820cc202630344aa80e767a27cf15affb513 100644
Binary files a/bob/bio/csu/test/data/ldair_detected.hdf5 and b/bob/bio/csu/test/data/ldair_detected.hdf5 differ
diff --git a/bob/bio/csu/test/data/lrpca_detected.hdf5 b/bob/bio/csu/test/data/lrpca_detected.hdf5
index 2beab06a2ea00ac2ae451af774aece25fc355188..351d0dee4025c64274fb92e05efdd77942944038 100644
Binary files a/bob/bio/csu/test/data/lrpca_detected.hdf5 and b/bob/bio/csu/test/data/lrpca_detected.hdf5 differ
diff --git a/bob/bio/csu/test/test_preprocessors.py b/bob/bio/csu/test/test_preprocessors.py
index b3f7d5f79a0ddad1e0bc68c96f8a7220bfdbeee5..d4d9827bf1a231348c43cfb15eecad1b35b309a8 100644
--- a/bob/bio/csu/test/test_preprocessors.py
+++ b/bob/bio/csu/test/test_preprocessors.py
@@ -15,7 +15,17 @@ regenerate_refs = False
 import bob.bio.base
 import bob.bio.face
 
-from bob.bio.face.test.test_preprocessors import _annotation, _compare
+from bob.bio.face.test.test_preprocessors import _annotation
+
+def _compare(data, reference, write_function = bob.bio.base.save, read_function = bob.bio.base.load, atol = 1e-5, rtol = 1e-8):
+  # write reference?
+  if regenerate_refs:
+    write_function(data, reference)
+
+  # compare reference
+  reference = read_function(reference)
+  assert numpy.allclose(data, reference, atol=atol, rtol=rtol)
+  return reference
 
 
 def _image(preprocessor):