diff --git a/modules/io/pymod/__init__.py b/modules/io/pymod/__init__.py
index 9dea7dbc552b94b198cb8c80c9746dff8712e240..dbc139f63b1da9d80a706ce01090ff48df65f415 100644
--- a/modules/io/pymod/__init__.py
+++ b/modules/io/pymod/__init__.py
@@ -404,7 +404,7 @@ def _PDBize(biounit, asu, seqres=None, min_polymer_size=10,
     pdbizer.Add(assu, trans_matrices, ss)
   pdb_bu = pdbizer.Finish(transformation)
   if transformation:
-    return pdb_bu, pdb_bu.GetTransformationMatrix()
+    return pdb_bu, pdb_bu.GetTransform().GetMatrix()
   return pdb_bu
 
 MMCifInfoBioUnit.PDBize = _PDBize