diff --git a/tests/python_package_test/test_consistency.py b/tests/python_package_test/test_consistency.py
index 7c585c335b04..78598f878eb5 100644
--- a/tests/python_package_test/test_consistency.py
+++ b/tests/python_package_test/test_consistency.py
@@ -1,6 +1,5 @@
 # coding: utf-8
 import os
-import unittest
 
 import lightgbm as lgb
 import numpy as np