diff --git a/python/obitools3/dms/taxo/taxo.pyx b/python/obitools3/dms/taxo/taxo.pyx
index b49dff1..3724ea5 100644
--- a/python/obitools3/dms/taxo/taxo.pyx
+++ b/python/obitools3/dms/taxo/taxo.pyx
@@ -214,7 +214,7 @@ cdef class Taxonomy(OBIWrapper) :
            first ancestor to the root.
         """
         cdef Taxon taxon
-        taxon = self.get_taxon_by_idx(taxid)
+        taxon = self.get_taxon_by_taxid(taxid)
         if taxon is not None:
             while taxon.parent.taxid != 1:   # TODO was 0 before? 
                 yield taxon