diff --git a/xls2ddl/tmpls.py b/xls2ddl/tmpls.py
index 6da561c..8107f91 100644
--- a/xls2ddl/tmpls.py
+++ b/xls2ddl/tmpls.py
@@ -133,7 +133,7 @@ ns['sort'] = '{{relation.outter_field}}_text'
 sql = '''{{sql}}'''
 {% if not relation %}
 filterjson = params_kw.get('data_filter')
-fields_str='''{{json.dumps(fields, indent=4, ensure_ascii=False)}}'''
+fields_str=r'''{{json.dumps(fields, indent=4, ensure_ascii=False)}}'''
 ori_fields = json.loads(fields_str)
 if not filterjson:
 	fields = [ f['name'] for f in ori_fields ]