diff --git a/tests/system-test/1-insert/delete_data.py b/tests/system-test/1-insert/delete_data.py
index a7eba2d97d..3308c2e542 100644
--- a/tests/system-test/1-insert/delete_data.py
+++ b/tests/system-test/1-insert/delete_data.py
@@ -157,7 +157,7 @@ class TDTestCase:
             elif 'nchar' in column_type.lower():
                 tdSql.error(f'''delete from {tbname} where {error_list} {column_name} ="{base_data['nchar']}"''')
             else:
-                tdSql.error('delete from {tbname} where {error_list} {column_name} = {base_data[column_type]}')
+                tdSql.error(f'delete from {tbname} where {error_list} {column_name} = {base_data[column_type]}')
                 
     def delete_data_ntb(self):
         tdSql.execute(f'create database if not exists {self.dbname}')