diff --git a/python/paddle/fluid/tests/unittests/test_arg_min_max_op.py b/python/paddle/fluid/tests/unittests/test_arg_min_max_op.py
index 3639c4dea0a3a12aa46d2875affeebd4c623a4dd..c11fb3d1e28aaa4fe44fcd695d701bc674c267f1 100644
--- a/python/paddle/fluid/tests/unittests/test_arg_min_max_op.py
+++ b/python/paddle/fluid/tests/unittests/test_arg_min_max_op.py
@@ -92,7 +92,7 @@ class TestCase4(BaseTestCase):
         self.axis = 0
 
 
-class TestCase3(BaseTestCase):
+class TestCase3_(BaseTestCase):
     def initTestCase(self):
         self.op_type = 'arg_max'
         self.dims = (3, )