diff --git a/py-polars/tests/unit/io/test_csv.py b/py-polars/tests/unit/io/test_csv.py
index 577ca3bbe9e3..acc95a3297a1 100644
--- a/py-polars/tests/unit/io/test_csv.py
+++ b/py-polars/tests/unit/io/test_csv.py
@@ -2,6 +2,7 @@
 
 import gzip
 import io
+import os
 import sys
 import textwrap
 import zlib