diff --git a/tests/test_grib.py b/tests/test_grib.py
index 18f73155..7770125b 100644
--- a/tests/test_grib.py
+++ b/tests/test_grib.py
@@ -11,6 +11,7 @@
 
 from climetlab import load_source, plot_map
 import pytest
+import os
 
 
 def test_plot():