diff --git a/modules/io/pymod/export_mmcif_io.cc b/modules/io/pymod/export_mmcif_io.cc
index c94c72a6701f3044f4808b55851d604c7e6cf4b9..6654393be01fefaefa346b9f86bcdef5f63e9c7e 100644
--- a/modules/io/pymod/export_mmcif_io.cc
+++ b/modules/io/pymod/export_mmcif_io.cc
@@ -189,7 +189,7 @@ void export_mmcif_io()
                                    return_value_policy<copy_const_reference>()))
     .add_property("operations", make_function(&MMCifInfoBioUnit::GetOperations,
                                    return_value_policy<copy_const_reference>()))
-    .add_property("details", &MMCifInfoBioUnit::GetID, &MMCifInfoBioUnit::SetID)
+    .add_property("id", &MMCifInfoBioUnit::GetID, &MMCifInfoBioUnit::SetID)
   ;
 
   class_<MMCifInfoStructRefs>("MMCifInfoStructRefs", init<>())