diff --git a/python/paddle/v2/framework/tests/gradient_checker.py b/python/paddle/v2/framework/tests/gradient_checker.py
index e7fca05d6f79aaa26eeadf9ea7e1769ac035d6b0..0ee7e8fb490fa4bacd2377992abb11be721fde92 100644
--- a/python/paddle/v2/framework/tests/gradient_checker.py
+++ b/python/paddle/v2/framework/tests/gradient_checker.py
@@ -3,6 +3,8 @@ from paddle.v2.framework.create_op_creation_methods import op_creations
 import numpy
 import unittest
 
+__all__ = ['get_numeric_gradient']
+
 
 def get_numeric_gradient(op,
                          input_values,