diff --git a/pycen/zh.py b/pycen/zh.py
index aa7a071..49839e7 100644
--- a/pycen/zh.py
+++ b/pycen/zh.py
@@ -12,7 +12,7 @@ import pandas as pd
 # import pandas_access as mdb
 # import numpy as np
 # from sqlalchemy.sql.expression import column
-from sqlalchemy import create_engine
+# from sqlalchemy import create_engine
 from geoalchemy2 import Geometry
 from .pers.pers import _get_table
 from .sites.sites import _get_typ_milieux