diff --git a/cases/smoke/basic/screenshot32/new_script/testcases/test_xts.py b/cases/smoke/basic/screenshot32/new_script/testcases/test_xts.py
index 5d2607ae..11c6b8c4 100644
--- a/cases/smoke/basic/screenshot32/new_script/testcases/test_xts.py
+++ b/cases/smoke/basic/screenshot32/new_script/testcases/test_xts.py
@@ -7,7 +7,7 @@ import sys
 import unittest
 
 
-class Test(unittest.TestCases):
+class Test(unittest.testcases):
 
 
     @pytest.mark.parametrize('setup_teardown', [None], indirect=True)