diff --git a/tests/test_rendertools.py b/tests/test_rendertools.py
index ea4ad3c46f3465c2f30aabaf8ae9cff7e2efd7f7..dd746e7c5f434cd1630e338cbe4303921e6e694e 100644
--- a/tests/test_rendertools.py
+++ b/tests/test_rendertools.py
@@ -6,7 +6,7 @@ Tests for `flatland` package.
 
 from flatland.envs.rail_env import RailEnv, random_rail_generator
 import numpy as np
-import os
+# import os
 import sys
 
 import matplotlib.pyplot as plt