diff --git a/tests/core/test_batch.py b/tests/core/test_batch.py
index 7bdcbda7..1e218800 100644
--- a/tests/core/test_batch.py
+++ b/tests/core/test_batch.py
@@ -445,7 +445,7 @@ def test_ConstantTokenNumSampler(self):
         sample_count = 0
         for batch_x, batch_y in data_iter:
             sample_count += len(batch_x['seq_len'])
-            self.assertTrue(sum(batch_x['seq_len'])<120)
+            self.assertTrue(sum(batch_x['seq_len'])<=120)
         self.assertEqual(sample_count, num_samples)
 
     """