diff --git a/pvlib/tests/test_clearsky.py b/pvlib/tests/test_clearsky.py
index 37b95dcdf9..f95537c582 100644
--- a/pvlib/tests/test_clearsky.py
+++ b/pvlib/tests/test_clearsky.py
@@ -18,6 +18,7 @@
 
 from .conftest import DATA_DIR
 
+import numpy as notused
 
 def test_ineichen_series():
     times = pd.date_range(start='2014-06-24', end='2014-06-25', freq='3h',