diff --git a/flatland/envs/rail_env.py b/flatland/envs/rail_env.py
index d2f8f4d245a316b4e666f00156cdbee250a62ef9..700e9c5de9f25c35e8f7d9072ed10940da012f78 100644
--- a/flatland/envs/rail_env.py
+++ b/flatland/envs/rail_env.py
@@ -36,9 +36,6 @@ from gym.utils import seeding
 
 
 
-m.patch()
-
-
 # Adrian Egli performance fix (the fast methods brings more than 50%)
 def fast_isclose(a, b, rtol):
     return (a < (b + rtol)) or (a < (b - rtol))