diff --git a/python/paddle/v2/reader/tests/decorator_test.py b/python/paddle/v2/reader/tests/decorator_test.py
index 0bd773395507c074d962084cca8842a2026e798a..bb3c5d220b9ce1552d2fc429abb1863930cd4d17 100644
--- a/python/paddle/v2/reader/tests/decorator_test.py
+++ b/python/paddle/v2/reader/tests/decorator_test.py
@@ -134,7 +134,7 @@ class TestXmap(unittest.TestCase):
                 for size in buffered_size:
                     result = []
                     for i in paddle.v2.reader.xmap_readers(mapper,
-                                                           reader_creator_10(),
+                                                           reader_creator_10(0),
                                                            tNum, size, order)():
                         result.append(i)
                     if not order: