diff --git a/pandas/tests/series/methods/test_diff.py b/pandas/tests/series/methods/test_diff.py
index 50ef99f97942b..89c34aeb64206 100644
--- a/pandas/tests/series/methods/test_diff.py
+++ b/pandas/tests/series/methods/test_diff.py
@@ -1,4 +1,5 @@
 import numpy as np
+import pytest
 
 from pandas import (
     Series,